| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -S -instcombine | FileCheck %s |
| @A = extern_weak global i32, align 4 |
| @B = extern_weak global i32, align 4 |
| |
| define i32 @foo(i1 %which) { |
| ; CHECK-LABEL: @foo( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]] |
| ; CHECK: delay: |
| ; CHECK-NEXT: br label [[FINAL]] |
| ; CHECK: final: |
| ; CHECK-NEXT: [[USE2:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ select (i1 icmp eq (i32* @A, i32* @B), i32 2, i32 1), [[DELAY]] ] |
| ; CHECK-NEXT: ret i32 [[USE2]] |
| ; |
| entry: |
| br i1 %which, label %final, label %delay |
| |
| delay: |
| br label %final |
| |
| final: |
| %use2 = phi i1 [ false, %entry ], [ icmp eq (i32* @A, i32* @B), %delay ] |
| %value = select i1 %use2, i32 2, i32 1 |
| ret i32 %value |
| } |
| |
| |
| ; test folding of select into phi for vectors. |
| define <4 x i64> @vec1(i1 %which) { |
| ; CHECK-LABEL: @vec1( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]] |
| ; CHECK: delay: |
| ; CHECK-NEXT: br label [[FINAL]] |
| ; CHECK: final: |
| ; CHECK-NEXT: [[PHINODE:%.*]] = phi <4 x i64> [ zeroinitializer, [[ENTRY:%.*]] ], [ <i64 0, i64 0, i64 126, i64 127>, [[DELAY]] ] |
| ; CHECK-NEXT: ret <4 x i64> [[PHINODE]] |
| ; |
| entry: |
| br i1 %which, label %final, label %delay |
| |
| delay: |
| br label %final |
| |
| final: |
| %phinode = phi <4 x i1> [ <i1 true, i1 true, i1 true, i1 true>, %entry ], [ <i1 true, i1 true, i1 false, i1 false>, %delay ] |
| %sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127> |
| ret <4 x i64> %sel |
| } |
| |
| define <4 x i64> @vec2(i1 %which) { |
| ; CHECK-LABEL: @vec2( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]] |
| ; CHECK: delay: |
| ; CHECK-NEXT: br label [[FINAL]] |
| ; CHECK: final: |
| ; CHECK-NEXT: [[PHINODE:%.*]] = phi <4 x i64> [ <i64 124, i64 125, i64 126, i64 127>, [[ENTRY:%.*]] ], [ <i64 0, i64 125, i64 0, i64 127>, [[DELAY]] ] |
| ; CHECK-NEXT: ret <4 x i64> [[PHINODE]] |
| ; |
| entry: |
| br i1 %which, label %final, label %delay |
| |
| delay: |
| br label %final |
| |
| final: |
| %phinode = phi <4 x i1> [ <i1 false, i1 false, i1 false, i1 false>, %entry ], [ <i1 true, i1 false, i1 true, i1 false>, %delay ] |
| %sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127> |
| ret <4 x i64> %sel |
| } |
| |
| ; Test PR33364 |
| ; Insert the generated select into the same block as the incoming phi value. |
| ; phi has constant vectors along with a single non-constant vector as operands. |
| define <2 x i8> @vec3(i1 %cond1, i1 %cond2, <2 x i1> %x, <2 x i8> %y, <2 x i8> %z) { |
| ; CHECK-LABEL: @vec3( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[PHI_SEL1:%.*]] = shufflevector <2 x i8> [[Z:%.*]], <2 x i8> [[Y:%.*]], <2 x i32> <i32 0, i32 3> |
| ; CHECK-NEXT: br i1 [[COND1:%.*]], label [[IF1:%.*]], label [[ELSE:%.*]] |
| ; CHECK: if1: |
| ; CHECK-NEXT: [[PHI_SEL2:%.*]] = shufflevector <2 x i8> [[Y]], <2 x i8> [[Z]], <2 x i32> <i32 0, i32 3> |
| ; CHECK-NEXT: br i1 [[COND2:%.*]], label [[IF2:%.*]], label [[ELSE]] |
| ; CHECK: if2: |
| ; CHECK-NEXT: [[PHI_SEL:%.*]] = select <2 x i1> [[X:%.*]], <2 x i8> [[Y]], <2 x i8> [[Z]] |
| ; CHECK-NEXT: br label [[ELSE]] |
| ; CHECK: else: |
| ; CHECK-NEXT: [[PHI:%.*]] = phi <2 x i8> [ [[PHI_SEL]], [[IF2]] ], [ [[PHI_SEL1]], [[ENTRY:%.*]] ], [ [[PHI_SEL2]], [[IF1]] ] |
| ; CHECK-NEXT: ret <2 x i8> [[PHI]] |
| ; |
| entry: |
| br i1 %cond1, label %if1, label %else |
| |
| if1: |
| br i1 %cond2, label %if2, label %else |
| |
| if2: |
| br label %else |
| |
| else: |
| %phi = phi <2 x i1> [ %x, %if2 ], [ <i1 0, i1 1>, %entry ], [ <i1 1, i1 0>, %if1 ] |
| %sel = select <2 x i1> %phi, <2 x i8> %y, <2 x i8> %z |
| ret <2 x i8> %sel |
| } |
| |
| ; Don't crash on unreachable IR. |
| |
| define void @PR48369(i32 %a, i32* %p) { |
| ; CHECK-LABEL: @PR48369( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[PHI_CMP:%.*]] = icmp sgt i32 [[A:%.*]], 0 |
| ; CHECK-NEXT: br label [[BB1:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: [[CMP:%.*]] = phi i1 [ [[PHI_CMP]], [[DEADBB:%.*]] ], [ true, [[ENTRY:%.*]] ] |
| ; CHECK-NEXT: [[SHL:%.*]] = select i1 [[CMP]], i32 256, i32 0 |
| ; CHECK-NEXT: store i32 [[SHL]], i32* [[P:%.*]], align 4 |
| ; CHECK-NEXT: br label [[END:%.*]] |
| ; CHECK: deadbb: |
| ; CHECK-NEXT: br label [[BB1]] |
| ; CHECK: end: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %phi.cmp = icmp sgt i32 %a, 0 |
| br label %bb1 |
| |
| bb1: |
| %cmp = phi i1 [ %phi.cmp, %deadbb ], [ true, %entry ] |
| %shl = select i1 %cmp, i32 256, i32 0 |
| store i32 %shl, i32* %p |
| br label %end |
| |
| deadbb: |
| br label %bb1 |
| |
| end: |
| ret void |
| } |
| |
| define i16 @sink_to_unreachable_crash(i1 %a) { |
| ; CHECK-LABEL: @sink_to_unreachable_crash( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[S:%.*]] = select i1 [[A:%.*]], i16 0, i16 5 |
| ; CHECK-NEXT: br label [[INF_LOOP:%.*]] |
| ; CHECK: inf_loop: |
| ; CHECK-NEXT: br label [[INF_LOOP]] |
| ; CHECK: unreachable: |
| ; CHECK-NEXT: ret i16 [[S]] |
| ; |
| entry: |
| %s = select i1 %a, i16 0, i16 5 |
| br label %inf_loop |
| |
| inf_loop: |
| br label %inf_loop |
| |
| unreachable: ; No predecessors! |
| ret i16 %s |
| } |