| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5 |
| ; RUN: opt -p loop-vectorize -force-vector-width=2 -S %s | FileCheck %s |
| |
| declare void @llvm.assume(i1) |
| |
| ; %a is known dereferenceable via assume for the whole loop. |
| define void @deref_assumption_in_preheader_non_constant_trip_count_access_i8(ptr noalias noundef %a, ptr noalias %b, ptr noalias %c, i64 %n) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_in_preheader_non_constant_trip_count_access_i8( |
| ; CHECK-SAME: ptr noalias noundef [[A:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[N:%.*]]) #[[ATTR1:[0-9]+]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[A]], i64 4), "dereferenceable"(ptr [[A]], i64 [[N]]) ] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[TMP0:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ] |
| ; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP0]] |
| ; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[B]], i64 [[TMP0]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i8>, ptr [[TMP2]], align 1 |
| ; CHECK-NEXT: [[TMP4:%.*]] = icmp sge <2 x i8> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <2 x i8>, ptr [[TMP1]], align 1 |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP4]], <2 x i8> [[WIDE_LOAD]], <2 x i8> [[WIDE_LOAD1]] |
| ; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i8, ptr [[C]], i64 [[TMP0]] |
| ; CHECK-NEXT: store <2 x i8> [[PREDPHI]], ptr [[TMP6]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP0]], 2 |
| ; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP8]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP_HEADER:.*]] |
| ; CHECK: [[LOOP_HEADER]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i8, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i8, ptr [[GEP_B]], align 1 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i8 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i8, ptr [[GEP_A]], align 1 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i8 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP_HEADER]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i8, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i8 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP3:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| call void @llvm.assume(i1 true) [ "align"(ptr %a, i64 4), "dereferenceable"(ptr %a, i64 %n) ] |
| br label %loop.header |
| |
| loop.header: |
| %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ] |
| %gep.a = getelementptr inbounds i8, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i8, ptr %b, i64 %iv |
| %l.b = load i8, ptr %gep.b, align 1 |
| %c.1 = icmp sge i8 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: |
| %l.a = load i8, ptr %gep.a, align 1 |
| br label %loop.latch |
| |
| loop.latch: |
| %merge = phi i8 [ %l.a, %loop.then ], [ %l.b, %loop.header ] |
| %gep.c = getelementptr inbounds i8, ptr %c, i64 %iv |
| store i8 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %ec = icmp eq i64 %iv.next, %n |
| br i1 %ec, label %exit, label %loop.header |
| |
| exit: |
| ret void |
| } |
| |
| ; %a is known dereferenceable via assume for the whole loop. |
| define void @deref_assumption_in_preheader_non_constant_trip_count_access_i32(ptr noalias noundef %a, ptr noalias %b, ptr noalias %c, i64 %n) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_in_preheader_non_constant_trip_count_access_i32( |
| ; CHECK-SAME: ptr noalias noundef [[A:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[N:%.*]]) #[[ATTR1]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i64 [[N]], 4 |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[A]], i64 4), "dereferenceable"(ptr [[A]], i64 [[MUL]]) ] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[TMP0:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ] |
| ; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[A]], i64 [[TMP0]] |
| ; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[TMP0]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP2]], align 1 |
| ; CHECK-NEXT: [[TMP4:%.*]] = icmp sge <2 x i32> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <2 x i32>, ptr [[TMP1]], align 1 |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP4]], <2 x i32> [[WIDE_LOAD]], <2 x i32> [[WIDE_LOAD1]] |
| ; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[TMP0]] |
| ; CHECK-NEXT: store <2 x i32> [[PREDPHI]], ptr [[TMP6]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP0]], 2 |
| ; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP8]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP_HEADER:.*]] |
| ; CHECK: [[LOOP_HEADER]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 1 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 1 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP_HEADER]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i32 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP5:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %mul = mul nsw nuw i64 %n, 4 |
| call void @llvm.assume(i1 true) [ "align"(ptr %a, i64 4), "dereferenceable"(ptr %a, i64 %mul) ] |
| br label %loop.header |
| |
| loop.header: |
| %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ] |
| %gep.a = getelementptr inbounds i32, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i32, ptr %b, i64 %iv |
| %l.b = load i32, ptr %gep.b, align 1 |
| %c.1 = icmp sge i32 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: |
| %l.a = load i32, ptr %gep.a, align 1 |
| br label %loop.latch |
| |
| loop.latch: |
| %merge = phi i32 [ %l.a, %loop.then ], [ %l.b, %loop.header ] |
| %gep.c = getelementptr inbounds i32, ptr %c, i64 %iv |
| store i32 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %ec = icmp eq i64 %iv.next, %n |
| br i1 %ec, label %exit, label %loop.header |
| |
| exit: |
| ret void |
| } |
| |
| |
| ; %a is NOT known dereferenceable via assume for the whole loop. |
| define void @deref_assumption_in_preheader_too_small_non_constant_trip_count_access_i32(ptr noalias noundef %a, ptr noalias %b, ptr noalias %c, i64 %n) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_in_preheader_too_small_non_constant_trip_count_access_i32( |
| ; CHECK-SAME: ptr noalias noundef [[A:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[N:%.*]]) #[[ATTR1]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[A]], i64 4), "dereferenceable"(ptr [[A]], i64 [[N]]) ] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[TMP0:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ] |
| ; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[TMP0]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP2]], align 1 |
| ; CHECK-NEXT: [[TMP15:%.*]] = icmp slt <2 x i32> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[TMP5:%.*]] = extractelement <2 x i1> [[TMP15]], i32 0 |
| ; CHECK-NEXT: br i1 [[TMP5]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]] |
| ; CHECK: [[PRED_LOAD_IF]]: |
| ; CHECK-NEXT: [[TMP19:%.*]] = add i64 [[TMP0]], 0 |
| ; CHECK-NEXT: [[TMP16:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP19]] |
| ; CHECK-NEXT: [[TMP17:%.*]] = load i32, ptr [[TMP16]], align 1 |
| ; CHECK-NEXT: [[TMP18:%.*]] = insertelement <2 x i32> poison, i32 [[TMP17]], i32 0 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]] |
| ; CHECK: [[PRED_LOAD_CONTINUE]]: |
| ; CHECK-NEXT: [[TMP9:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP18]], %[[PRED_LOAD_IF]] ] |
| ; CHECK-NEXT: [[TMP10:%.*]] = extractelement <2 x i1> [[TMP15]], i32 1 |
| ; CHECK-NEXT: br i1 [[TMP10]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_IF1]]: |
| ; CHECK-NEXT: [[TMP11:%.*]] = add i64 [[TMP0]], 1 |
| ; CHECK-NEXT: [[TMP12:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP11]] |
| ; CHECK-NEXT: [[TMP13:%.*]] = load i32, ptr [[TMP12]], align 1 |
| ; CHECK-NEXT: [[TMP14:%.*]] = insertelement <2 x i32> [[TMP9]], i32 [[TMP13]], i32 1 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_CONTINUE2]]: |
| ; CHECK-NEXT: [[TMP20:%.*]] = phi <2 x i32> [ [[TMP9]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], %[[PRED_LOAD_IF1]] ] |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP15]], <2 x i32> [[TMP20]], <2 x i32> [[WIDE_LOAD]] |
| ; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[TMP0]] |
| ; CHECK-NEXT: store <2 x i32> [[PREDPHI]], ptr [[TMP6]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP0]], 2 |
| ; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP8]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP_HEADER:.*]] |
| ; CHECK: [[LOOP_HEADER]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 1 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 1 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP_HEADER]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i32 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP7:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| call void @llvm.assume(i1 true) [ "align"(ptr %a, i64 4), "dereferenceable"(ptr %a, i64 %n) ] |
| br label %loop.header |
| |
| loop.header: |
| %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ] |
| %gep.a = getelementptr inbounds i32, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i32, ptr %b, i64 %iv |
| %l.b = load i32, ptr %gep.b, align 1 |
| %c.1 = icmp sge i32 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: |
| %l.a = load i32, ptr %gep.a, align 1 |
| br label %loop.latch |
| |
| loop.latch: |
| %merge = phi i32 [ %l.a, %loop.then ], [ %l.b, %loop.header ] |
| %gep.c = getelementptr inbounds i32, ptr %c, i64 %iv |
| store i32 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %ec = icmp eq i64 %iv.next, %n |
| br i1 %ec, label %exit, label %loop.header |
| |
| exit: |
| ret void |
| } |
| |
| ; %a is NOT known dereferenceable via assume for the whole loop. |
| define void @deref_assumption_in_preheader_too_small2_non_constant_trip_count_access_i32(ptr noalias noundef %a, ptr noalias %b, ptr noalias %c, i64 %n) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_in_preheader_too_small2_non_constant_trip_count_access_i32( |
| ; CHECK-SAME: ptr noalias noundef [[A:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[N:%.*]]) #[[ATTR1]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[A]], i64 4), "dereferenceable"(ptr [[A]], i64 100) ] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[TMP0:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ] |
| ; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[TMP0]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP2]], align 1 |
| ; CHECK-NEXT: [[TMP15:%.*]] = icmp slt <2 x i32> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[TMP5:%.*]] = extractelement <2 x i1> [[TMP15]], i32 0 |
| ; CHECK-NEXT: br i1 [[TMP5]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]] |
| ; CHECK: [[PRED_LOAD_IF]]: |
| ; CHECK-NEXT: [[TMP19:%.*]] = add i64 [[TMP0]], 0 |
| ; CHECK-NEXT: [[TMP16:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP19]] |
| ; CHECK-NEXT: [[TMP17:%.*]] = load i32, ptr [[TMP16]], align 1 |
| ; CHECK-NEXT: [[TMP18:%.*]] = insertelement <2 x i32> poison, i32 [[TMP17]], i32 0 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]] |
| ; CHECK: [[PRED_LOAD_CONTINUE]]: |
| ; CHECK-NEXT: [[TMP9:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP18]], %[[PRED_LOAD_IF]] ] |
| ; CHECK-NEXT: [[TMP10:%.*]] = extractelement <2 x i1> [[TMP15]], i32 1 |
| ; CHECK-NEXT: br i1 [[TMP10]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_IF1]]: |
| ; CHECK-NEXT: [[TMP11:%.*]] = add i64 [[TMP0]], 1 |
| ; CHECK-NEXT: [[TMP12:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP11]] |
| ; CHECK-NEXT: [[TMP13:%.*]] = load i32, ptr [[TMP12]], align 1 |
| ; CHECK-NEXT: [[TMP14:%.*]] = insertelement <2 x i32> [[TMP9]], i32 [[TMP13]], i32 1 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_CONTINUE2]]: |
| ; CHECK-NEXT: [[TMP20:%.*]] = phi <2 x i32> [ [[TMP9]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], %[[PRED_LOAD_IF1]] ] |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP15]], <2 x i32> [[TMP20]], <2 x i32> [[WIDE_LOAD]] |
| ; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[TMP0]] |
| ; CHECK-NEXT: store <2 x i32> [[PREDPHI]], ptr [[TMP6]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP0]], 2 |
| ; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP8]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP_HEADER:.*]] |
| ; CHECK: [[LOOP_HEADER]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 1 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 1 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP_HEADER]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i32 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP9:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| call void @llvm.assume(i1 true) [ "align"(ptr %a, i64 4), "dereferenceable"(ptr %a, i64 100) ] |
| br label %loop.header |
| |
| loop.header: |
| %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ] |
| %gep.a = getelementptr inbounds i32, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i32, ptr %b, i64 %iv |
| %l.b = load i32, ptr %gep.b, align 1 |
| %c.1 = icmp sge i32 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: |
| %l.a = load i32, ptr %gep.a, align 1 |
| br label %loop.latch |
| |
| loop.latch: |
| %merge = phi i32 [ %l.a, %loop.then ], [ %l.b, %loop.header ] |
| %gep.c = getelementptr inbounds i32, ptr %c, i64 %iv |
| store i32 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %ec = icmp eq i64 %iv.next, %n |
| br i1 %ec, label %exit, label %loop.header |
| |
| exit: |
| ret void |
| } |
| |
| ; %a is known dereferenceable via assume for the whole loop, alignment is known via function attribute. |
| define void @deref_assumption_in_preheader_non_constant_trip_count_access_i32_align_attribute(ptr noalias noundef align 4 %a, ptr noalias %b, ptr noalias %c, i64 %n) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_in_preheader_non_constant_trip_count_access_i32_align_attribute( |
| ; CHECK-SAME: ptr noalias noundef align 4 [[A:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[N:%.*]]) #[[ATTR1]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i64 [[N]], 4 |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[A]], i64 [[MUL]]) ] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ] |
| ; CHECK-NEXT: [[TMP0:%.*]] = getelementptr i32, ptr [[A]], i64 [[INDEX]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[INDEX]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP1]], align 4 |
| ; CHECK-NEXT: [[TMP3:%.*]] = icmp sge <2 x i32> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <2 x i32>, ptr [[TMP0]], align 4 |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP3]], <2 x i32> [[WIDE_LOAD]], <2 x i32> [[WIDE_LOAD1]] |
| ; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[INDEX]] |
| ; CHECK-NEXT: store <2 x i32> [[PREDPHI]], ptr [[TMP5]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2 |
| ; CHECK-NEXT: [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP7]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP_HEADER:.*]] |
| ; CHECK: [[LOOP_HEADER]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 4 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 4 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP_HEADER]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i32 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP11:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %mul = mul nsw nuw i64 %n, 4 |
| call void @llvm.assume(i1 true) [ "dereferenceable"(ptr %a, i64 %mul) ] |
| br label %loop.header |
| |
| loop.header: |
| %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ] |
| %gep.a = getelementptr inbounds i32, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i32, ptr %b, i64 %iv |
| %l.b = load i32, ptr %gep.b, align 4 |
| %c.1 = icmp sge i32 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: |
| %l.a = load i32, ptr %gep.a, align 4 |
| br label %loop.latch |
| |
| loop.latch: |
| %merge = phi i32 [ %l.a, %loop.then ], [ %l.b, %loop.header ] |
| %gep.c = getelementptr inbounds i32, ptr %c, i64 %iv |
| store i32 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %ec = icmp eq i64 %iv.next, %n |
| br i1 %ec, label %exit, label %loop.header |
| |
| exit: |
| ret void |
| } |
| |
| ; Alignment via argument attribute is too small (1 but needs 4). |
| define void @deref_assumption_in_preheader_non_constant_trip_count_access_i32_align_attribute_too_small(ptr noalias noundef align 1 %a, ptr noalias %b, ptr noalias %c, i64 %n) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_in_preheader_non_constant_trip_count_access_i32_align_attribute_too_small( |
| ; CHECK-SAME: ptr noalias noundef align 1 [[A:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[N:%.*]]) #[[ATTR1]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i64 [[N]], 4 |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[A]], i64 [[MUL]]) ] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ] |
| ; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[INDEX]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP0]], align 4 |
| ; CHECK-NEXT: [[TMP3:%.*]] = icmp slt <2 x i32> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[TMP4:%.*]] = extractelement <2 x i1> [[TMP3]], i32 0 |
| ; CHECK-NEXT: br i1 [[TMP4]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]] |
| ; CHECK: [[PRED_LOAD_IF]]: |
| ; CHECK-NEXT: [[TMP5:%.*]] = add i64 [[INDEX]], 0 |
| ; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP5]] |
| ; CHECK-NEXT: [[TMP7:%.*]] = load i32, ptr [[TMP6]], align 4 |
| ; CHECK-NEXT: [[TMP8:%.*]] = insertelement <2 x i32> poison, i32 [[TMP7]], i32 0 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]] |
| ; CHECK: [[PRED_LOAD_CONTINUE]]: |
| ; CHECK-NEXT: [[TMP9:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP8]], %[[PRED_LOAD_IF]] ] |
| ; CHECK-NEXT: [[TMP10:%.*]] = extractelement <2 x i1> [[TMP3]], i32 1 |
| ; CHECK-NEXT: br i1 [[TMP10]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_IF1]]: |
| ; CHECK-NEXT: [[TMP11:%.*]] = add i64 [[INDEX]], 1 |
| ; CHECK-NEXT: [[TMP12:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP11]] |
| ; CHECK-NEXT: [[TMP13:%.*]] = load i32, ptr [[TMP12]], align 4 |
| ; CHECK-NEXT: [[TMP14:%.*]] = insertelement <2 x i32> [[TMP9]], i32 [[TMP13]], i32 1 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_CONTINUE2]]: |
| ; CHECK-NEXT: [[TMP15:%.*]] = phi <2 x i32> [ [[TMP9]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], %[[PRED_LOAD_IF1]] ] |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP3]], <2 x i32> [[TMP15]], <2 x i32> [[WIDE_LOAD]] |
| ; CHECK-NEXT: [[TMP16:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[INDEX]] |
| ; CHECK-NEXT: store <2 x i32> [[PREDPHI]], ptr [[TMP16]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2 |
| ; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP18]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP12:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP_HEADER:.*]] |
| ; CHECK: [[LOOP_HEADER]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 4 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 4 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP_HEADER]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i32 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP13:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %mul = mul nsw nuw i64 %n, 4 |
| call void @llvm.assume(i1 true) [ "dereferenceable"(ptr %a, i64 %mul) ] |
| br label %loop.header |
| |
| loop.header: |
| %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ] |
| %gep.a = getelementptr inbounds i32, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i32, ptr %b, i64 %iv |
| %l.b = load i32, ptr %gep.b, align 4 |
| %c.1 = icmp sge i32 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: |
| %l.a = load i32, ptr %gep.a, align 4 |
| br label %loop.latch |
| |
| loop.latch: |
| %merge = phi i32 [ %l.a, %loop.then ], [ %l.b, %loop.header ] |
| %gep.c = getelementptr inbounds i32, ptr %c, i64 %iv |
| store i32 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %ec = icmp eq i64 %iv.next, %n |
| br i1 %ec, label %exit, label %loop.header |
| |
| exit: |
| ret void |
| } |
| |
| ; The start access is SCEV with non-constant offset because of variable `iv.start` |
| ; for IV. |
| define void @deref_assumption_loop_access_start_variable(i8 %v, ptr noundef %P, i64 range(i64 0, 2000) %N, ptr noalias %b, ptr noalias %c, i64 range(i64 0, 2000) %iv.start) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_loop_access_start_variable( |
| ; CHECK-SAME: i8 [[V:%.*]], ptr noundef [[P:%.*]], i64 range(i64 0, 2000) [[N:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 range(i64 0, 2000) [[IV_START:%.*]]) #[[ATTR1]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: [[A:%.*]] = getelementptr i8, ptr [[P]], i64 16 |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i64 [[IV_START]], [[N]] |
| ; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]]) |
| ; CHECK-NEXT: [[MUL:%.*]] = mul i64 [[N]], 4 |
| ; CHECK-NEXT: [[ADD:%.*]] = add i64 [[MUL]], 16 |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 [[ADD]]) ] |
| ; CHECK-NEXT: [[TMP3:%.*]] = sub i64 [[N]], [[IV_START]] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP3]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP3]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP3]], [[N_MOD_VF]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = add i64 [[IV_START]], [[N_VEC]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ] |
| ; CHECK-NEXT: [[OFFSET_IDX:%.*]] = add i64 [[IV_START]], [[INDEX]] |
| ; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[OFFSET_IDX]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP6]], align 1 |
| ; CHECK-NEXT: [[TMP4:%.*]] = icmp slt <2 x i32> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[TMP5:%.*]] = extractelement <2 x i1> [[TMP4]], i32 0 |
| ; CHECK-NEXT: br i1 [[TMP5]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]] |
| ; CHECK: [[PRED_LOAD_IF]]: |
| ; CHECK-NEXT: [[TMP16:%.*]] = add i64 [[OFFSET_IDX]], 0 |
| ; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP16]] |
| ; CHECK-NEXT: [[TMP19:%.*]] = load i32, ptr [[TMP7]], align 1 |
| ; CHECK-NEXT: [[TMP9:%.*]] = insertelement <2 x i32> poison, i32 [[TMP19]], i32 0 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]] |
| ; CHECK: [[PRED_LOAD_CONTINUE]]: |
| ; CHECK-NEXT: [[TMP10:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP9]], %[[PRED_LOAD_IF]] ] |
| ; CHECK-NEXT: [[TMP11:%.*]] = extractelement <2 x i1> [[TMP4]], i32 1 |
| ; CHECK-NEXT: br i1 [[TMP11]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_IF1]]: |
| ; CHECK-NEXT: [[TMP12:%.*]] = add i64 [[OFFSET_IDX]], 1 |
| ; CHECK-NEXT: [[TMP13:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP12]] |
| ; CHECK-NEXT: [[TMP14:%.*]] = load i32, ptr [[TMP13]], align 1 |
| ; CHECK-NEXT: [[TMP15:%.*]] = insertelement <2 x i32> [[TMP10]], i32 [[TMP14]], i32 1 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_CONTINUE2]]: |
| ; CHECK-NEXT: [[TMP20:%.*]] = phi <2 x i32> [ [[TMP10]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP15]], %[[PRED_LOAD_IF1]] ] |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP4]], <2 x i32> [[TMP20]], <2 x i32> [[WIDE_LOAD]] |
| ; CHECK-NEXT: [[TMP17:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[OFFSET_IDX]] |
| ; CHECK-NEXT: store <2 x i32> [[PREDPHI]], ptr [[TMP17]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2 |
| ; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP18]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP14:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP3]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[TMP1]], %[[MIDDLE_BLOCK]] ], [ [[IV_START]], %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP:.*]] |
| ; CHECK: [[LOOP]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 1 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 1 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i32 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[TERM_COND:%.*]] = icmp slt i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[TERM_COND]], label %[[LOOP]], label %[[EXIT]], !llvm.loop [[LOOP15:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| |
| entry: |
| %a = getelementptr i8, ptr %P, i64 16 |
| %cmp = icmp slt i64 %iv.start, %N |
| call void @llvm.assume(i1 %cmp) |
| %mul = mul i64 %N, 4 |
| %add = add i64 %mul, 16 |
| call void @llvm.assume(i1 true) [ "dereferenceable"(ptr %P, i64 %add) ] |
| br label %loop |
| |
| loop: ; preds = %mainloop, %loop.latch |
| %iv = phi i64 [ %iv.next, %loop.latch ], [ %iv.start, %entry ] |
| %gep.a = getelementptr inbounds i32, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i32, ptr %b, i64 %iv |
| %l.b = load i32, ptr %gep.b, align 1 |
| %c.1 = icmp sge i32 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: ; preds = %loop |
| %l.a = load i32, ptr %gep.a, align 1 |
| br label %loop.latch |
| |
| loop.latch: ; preds = %loop.then, %loop |
| %merge = phi i32 [ %l.a, %loop.then ], [ %l.b, %loop ] |
| %gep.c = getelementptr inbounds i32, ptr %c, i64 %iv |
| store i32 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %term.cond = icmp slt i64 %iv.next, %N |
| br i1 %term.cond, label %loop, label %exit |
| |
| exit: |
| ret void |
| } |
| |
| ; Same as previous test, but `iv.start` is not known nonnegative. |
| define void @deref_assumption_loop_access_start_variable_unknown_range(i8 %v, ptr noundef %P, i64 range(i64 0, 2000) %N, ptr noalias %b, ptr noalias %c, i64 %iv.start) nofree nosync { |
| ; CHECK-LABEL: define void @deref_assumption_loop_access_start_variable_unknown_range( |
| ; CHECK-SAME: i8 [[V:%.*]], ptr noundef [[P:%.*]], i64 range(i64 0, 2000) [[N:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[IV_START:%.*]]) #[[ATTR1]] { |
| ; CHECK-NEXT: [[ENTRY:.*]]: |
| ; CHECK-NEXT: [[A:%.*]] = getelementptr i8, ptr [[P]], i64 16 |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i64 [[IV_START]], [[N]] |
| ; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]]) |
| ; CHECK-NEXT: [[MUL:%.*]] = mul i64 [[N]], 4 |
| ; CHECK-NEXT: [[ADD:%.*]] = add i64 [[MUL]], 16 |
| ; CHECK-NEXT: call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 [[ADD]]) ] |
| ; CHECK-NEXT: [[TMP0:%.*]] = sub i64 [[N]], [[IV_START]] |
| ; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 2 |
| ; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]] |
| ; CHECK: [[VECTOR_PH]]: |
| ; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 2 |
| ; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]] |
| ; CHECK-NEXT: [[TMP1:%.*]] = add i64 [[IV_START]], [[N_VEC]] |
| ; CHECK-NEXT: br label %[[VECTOR_BODY:.*]] |
| ; CHECK: [[VECTOR_BODY]]: |
| ; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ] |
| ; CHECK-NEXT: [[OFFSET_IDX:%.*]] = add i64 [[IV_START]], [[INDEX]] |
| ; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[OFFSET_IDX]] |
| ; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP2]], align 1 |
| ; CHECK-NEXT: [[TMP4:%.*]] = icmp slt <2 x i32> [[WIDE_LOAD]], zeroinitializer |
| ; CHECK-NEXT: [[TMP5:%.*]] = extractelement <2 x i1> [[TMP4]], i32 0 |
| ; CHECK-NEXT: br i1 [[TMP5]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]] |
| ; CHECK: [[PRED_LOAD_IF]]: |
| ; CHECK-NEXT: [[TMP6:%.*]] = add i64 [[OFFSET_IDX]], 0 |
| ; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP6]] |
| ; CHECK-NEXT: [[TMP8:%.*]] = load i32, ptr [[TMP7]], align 1 |
| ; CHECK-NEXT: [[TMP9:%.*]] = insertelement <2 x i32> poison, i32 [[TMP8]], i32 0 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]] |
| ; CHECK: [[PRED_LOAD_CONTINUE]]: |
| ; CHECK-NEXT: [[TMP10:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP9]], %[[PRED_LOAD_IF]] ] |
| ; CHECK-NEXT: [[TMP11:%.*]] = extractelement <2 x i1> [[TMP4]], i32 1 |
| ; CHECK-NEXT: br i1 [[TMP11]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_IF1]]: |
| ; CHECK-NEXT: [[TMP12:%.*]] = add i64 [[OFFSET_IDX]], 1 |
| ; CHECK-NEXT: [[TMP13:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP12]] |
| ; CHECK-NEXT: [[TMP14:%.*]] = load i32, ptr [[TMP13]], align 1 |
| ; CHECK-NEXT: [[TMP15:%.*]] = insertelement <2 x i32> [[TMP10]], i32 [[TMP14]], i32 1 |
| ; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]] |
| ; CHECK: [[PRED_LOAD_CONTINUE2]]: |
| ; CHECK-NEXT: [[TMP16:%.*]] = phi <2 x i32> [ [[TMP10]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP15]], %[[PRED_LOAD_IF1]] ] |
| ; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP4]], <2 x i32> [[TMP16]], <2 x i32> [[WIDE_LOAD]] |
| ; CHECK-NEXT: [[TMP17:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[OFFSET_IDX]] |
| ; CHECK-NEXT: store <2 x i32> [[PREDPHI]], ptr [[TMP17]], align 1 |
| ; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2 |
| ; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[TMP18]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP16:![0-9]+]] |
| ; CHECK: [[MIDDLE_BLOCK]]: |
| ; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]] |
| ; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]] |
| ; CHECK: [[SCALAR_PH]]: |
| ; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[TMP1]], %[[MIDDLE_BLOCK]] ], [ [[IV_START]], %[[ENTRY]] ] |
| ; CHECK-NEXT: br label %[[LOOP:.*]] |
| ; CHECK: [[LOOP]]: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ] |
| ; CHECK-NEXT: [[GEP_A:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]] |
| ; CHECK-NEXT: [[GEP_B:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]] |
| ; CHECK-NEXT: [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 1 |
| ; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[L_B]], 0 |
| ; CHECK-NEXT: br i1 [[C_1]], label %[[LOOP_LATCH]], label %[[LOOP_THEN:.*]] |
| ; CHECK: [[LOOP_THEN]]: |
| ; CHECK-NEXT: [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 1 |
| ; CHECK-NEXT: br label %[[LOOP_LATCH]] |
| ; CHECK: [[LOOP_LATCH]]: |
| ; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ [[L_A]], %[[LOOP_THEN]] ], [ [[L_B]], %[[LOOP]] ] |
| ; CHECK-NEXT: [[GEP_C:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]] |
| ; CHECK-NEXT: store i32 [[MERGE]], ptr [[GEP_C]], align 1 |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 |
| ; CHECK-NEXT: [[TERM_COND:%.*]] = icmp slt i64 [[IV_NEXT]], [[N]] |
| ; CHECK-NEXT: br i1 [[TERM_COND]], label %[[LOOP]], label %[[EXIT]], !llvm.loop [[LOOP17:![0-9]+]] |
| ; CHECK: [[EXIT]]: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %a = getelementptr i8, ptr %P, i64 16 |
| %cmp = icmp slt i64 %iv.start, %N |
| call void @llvm.assume(i1 %cmp) |
| %mul = mul i64 %N, 4 |
| %add = add i64 %mul, 16 |
| call void @llvm.assume(i1 true) [ "dereferenceable"(ptr %P, i64 %add) ] |
| br label %loop |
| |
| loop: ; preds = %mainloop, %loop.latch |
| %iv = phi i64 [ %iv.next, %loop.latch ], [ %iv.start, %entry ] |
| %gep.a = getelementptr inbounds i32, ptr %a, i64 %iv |
| %gep.b = getelementptr inbounds i32, ptr %b, i64 %iv |
| %l.b = load i32, ptr %gep.b, align 1 |
| %c.1 = icmp sge i32 %l.b, 0 |
| br i1 %c.1, label %loop.latch, label %loop.then |
| |
| loop.then: ; preds = %loop |
| %l.a = load i32, ptr %gep.a, align 1 |
| br label %loop.latch |
| |
| loop.latch: ; preds = %loop.then, %loop |
| %merge = phi i32 [ %l.a, %loop.then ], [ %l.b, %loop ] |
| %gep.c = getelementptr inbounds i32, ptr %c, i64 %iv |
| store i32 %merge, ptr %gep.c, align 1 |
| %iv.next = add nuw nsw i64 %iv, 1 |
| %term.cond = icmp slt i64 %iv.next, %N |
| br i1 %term.cond, label %loop, label %exit |
| |
| exit: |
| ret void |
| } |
