| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -passes=dse -dse-optimize-memoryssa=false -S %s | FileCheck --check-prefixes=CHECK,UNOPT %s |
| ; RUN: opt -passes=dse -dse-optimize-memoryssa -S %s | FileCheck --check-prefixes=CHECK,OPT %s |
| ; RUN: opt -passes=dse -S %s | FileCheck --check-prefixes=CHECK,OPT %s |
| |
| target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" |
| |
| @a = external global [32 x i8], align 16 |
| |
| declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) |
| |
| ; Test case for PR16520. The store in %if.then is redundant, because the same value |
| ; has been stored earlier to the same location. |
| define void @test1_pr16520(i1 %b, ptr nocapture %r) { |
| ; CHECK-LABEL: @test1_pr16520( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i8 1, ptr [[R:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]] |
| ; CHECK: if.then: |
| ; CHECK-NEXT: tail call void @fn_mayread_or_clobber() |
| ; CHECK-NEXT: br label [[IF_END:%.*]] |
| ; CHECK: if.else: |
| ; CHECK-NEXT: tail call void @fn_mayread_or_clobber() |
| ; CHECK-NEXT: br label [[IF_END]] |
| ; CHECK: if.end: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| store i8 1, ptr %r, align 1 |
| br i1 %b, label %if.then, label %if.else |
| |
| if.then: ; preds = %entry |
| store i8 1, ptr %r, align 1 |
| tail call void @fn_mayread_or_clobber() |
| br label %if.end |
| |
| if.else: ; preds = %entry |
| tail call void @fn_mayread_or_clobber() |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| ret void |
| } |
| |
| declare void @fn_mayread_or_clobber() |
| declare void @fn_readonly() readonly |
| |
| define void @test2(i1 %b, ptr nocapture %r) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i8 1, ptr [[R:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]] |
| ; CHECK: if.then: |
| ; CHECK-NEXT: tail call void @fn_readonly() |
| ; CHECK-NEXT: br label [[IF_END:%.*]] |
| ; CHECK: if.else: |
| ; CHECK-NEXT: tail call void @fn_readonly() |
| ; CHECK-NEXT: br label [[IF_END]] |
| ; CHECK: if.end: |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| store i8 1, ptr %r, align 1 |
| br i1 %b, label %if.then, label %if.else |
| |
| if.then: ; preds = %entry |
| tail call void @fn_readonly() |
| br label %if.end |
| |
| if.else: ; preds = %entry |
| tail call void @fn_readonly() |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| store i8 1, ptr %r, align 1 |
| ret void |
| } |
| |
| ; Make sure volatile stores are not removed. |
| define void @test2_volatile(i1 %b, ptr nocapture %r) { |
| ; CHECK-LABEL: @test2_volatile( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store volatile i8 1, ptr [[R:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]] |
| ; CHECK: if.then: |
| ; CHECK-NEXT: tail call void @fn_readonly() |
| ; CHECK-NEXT: br label [[IF_END:%.*]] |
| ; CHECK: if.else: |
| ; CHECK-NEXT: tail call void @fn_readonly() |
| ; CHECK-NEXT: br label [[IF_END]] |
| ; CHECK: if.end: |
| ; CHECK-NEXT: store volatile i8 1, ptr [[R]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| store volatile i8 1, ptr %r, align 1 |
| br i1 %b, label %if.then, label %if.else |
| |
| if.then: ; preds = %entry |
| tail call void @fn_readonly() |
| br label %if.end |
| |
| if.else: ; preds = %entry |
| tail call void @fn_readonly() |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| store volatile i8 1, ptr %r, align 1 |
| ret void |
| } |
| |
| define void @test3(i1 %b, ptr nocapture %r) { |
| ; CHECK-LABEL: @test3( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i8 1, ptr [[R:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]] |
| ; CHECK: if.then: |
| ; CHECK-NEXT: tail call void @fn_mayread_or_clobber() |
| ; CHECK-NEXT: br label [[IF_END:%.*]] |
| ; CHECK: if.else: |
| ; CHECK-NEXT: tail call void @fn_readonly() |
| ; CHECK-NEXT: br label [[IF_END]] |
| ; CHECK: if.end: |
| ; CHECK-NEXT: store i8 1, ptr [[R]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| store i8 1, ptr %r, align 1 |
| br i1 %b, label %if.then, label %if.else |
| |
| if.then: ; preds = %entry |
| tail call void @fn_mayread_or_clobber() |
| br label %if.end |
| |
| if.else: ; preds = %entry |
| tail call void @fn_readonly() |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| store i8 1, ptr %r, align 1 |
| ret void |
| } |
| |
| define void @test4(i1 %b, ptr nocapture %r) { |
| ; CHECK-LABEL: @test4( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i8 1, ptr [[R:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]] |
| ; CHECK: if.then: |
| ; CHECK-NEXT: tail call void @fn_readonly() |
| ; CHECK-NEXT: br label [[IF_END:%.*]] |
| ; CHECK: if.else: |
| ; CHECK-NEXT: tail call void @fn_mayread_or_clobber() |
| ; CHECK-NEXT: br label [[IF_END]] |
| ; CHECK: if.end: |
| ; CHECK-NEXT: store i8 1, ptr [[R]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| store i8 1, ptr %r, align 1 |
| br i1 %b, label %if.then, label %if.else |
| |
| if.then: ; preds = %entry |
| tail call void @fn_readonly() |
| br label %if.end |
| |
| if.else: ; preds = %entry |
| tail call void @fn_mayread_or_clobber() |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| store i8 1, ptr %r, align 1 |
| ret void |
| } |
| |
| define void @test5(i1 %b, ptr nocapture %r) { |
| ; CHECK-LABEL: @test5( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: store i8 1, ptr [[R:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[B:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]] |
| ; CHECK: if.then: |
| ; CHECK-NEXT: tail call void @fn_readonly() |
| ; CHECK-NEXT: br label [[IF_END:%.*]] |
| ; CHECK: if.else: |
| ; CHECK-NEXT: tail call void @fn_mayread_or_clobber() |
| ; CHECK-NEXT: br label [[IF_END]] |
| ; CHECK: if.end: |
| ; CHECK-NEXT: store i8 1, ptr [[R]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| store i8 1, ptr %r, align 1 |
| br i1 %b, label %if.then, label %if.else |
| |
| if.then: ; preds = %entry |
| tail call void @fn_readonly() |
| br label %if.end |
| |
| if.else: ; preds = %entry |
| tail call void @fn_mayread_or_clobber() |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| store i8 1, ptr %r, align 1 |
| ret void |
| } |
| |
| declare i1 @cond() readnone |
| |
| define void @test6(ptr noalias %P) { |
| ; CHECK-LABEL: @test6( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[FOR_HEADER:%.*]] |
| ; CHECK: for.header: |
| ; CHECK-NEXT: store i32 1, ptr [[P:%.*]], align 4 |
| ; CHECK-NEXT: [[C1:%.*]] = call i1 @cond() |
| ; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]] |
| ; CHECK: for.body: |
| ; CHECK-NEXT: [[LV:%.*]] = load i32, ptr [[P]], align 4 |
| ; CHECK-NEXT: br label [[FOR_HEADER]] |
| ; CHECK: end: |
| ; CHECK-NEXT: store i32 3, ptr [[P]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| br label %for.header |
| |
| for.header: |
| store i32 1, ptr %P, align 4 |
| %c1 = call i1 @cond() |
| br i1 %c1, label %for.body, label %end |
| |
| for.body: |
| store i32 1, ptr %P, align 4 |
| %lv = load i32, ptr %P |
| br label %for.header |
| |
| end: |
| store i32 3, ptr %P, align 4 |
| ret void |
| } |
| |
| ; Make sure the store in %bb3 can be eliminated in the presences of early returns. |
| define void @test7(ptr noalias %P) { |
| ; CHECK-LABEL: @test7( |
| ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 |
| ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[BB3:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: ret void |
| ; CHECK: bb3: |
| ; CHECK-NEXT: ret void |
| ; |
| store i32 0, ptr %P |
| br i1 true, label %bb1, label %bb2 |
| bb1: |
| br label %bb3 |
| bb2: |
| ret void |
| bb3: |
| store i32 0, ptr %P |
| ret void |
| } |
| |
| ; Make sure the store in %bb3 won't be eliminated because it may be clobbered before. |
| define void @test8(ptr %P) { |
| ; CHECK-LABEL: @test8( |
| ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 |
| ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: call void @fn_mayread_or_clobber() |
| ; CHECK-NEXT: br label [[BB3:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: ret void |
| ; CHECK: bb3: |
| ; CHECK-NEXT: store i32 0, ptr [[P]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| store i32 0, ptr %P |
| br i1 true, label %bb1, label %bb2 |
| bb1: |
| call void @fn_mayread_or_clobber() |
| br label %bb3 |
| bb2: |
| ret void |
| bb3: |
| store i32 0, ptr %P |
| ret void |
| } |
| |
| ; Make sure the store in %bb3 will be eliminated because only the early exit path |
| ; may be clobbered. |
| define void @test9(ptr noalias %P) { |
| ; CHECK-LABEL: @test9( |
| ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 |
| ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[BB3:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: call void @fn_mayread_or_clobber() |
| ; CHECK-NEXT: ret void |
| ; CHECK: bb3: |
| ; CHECK-NEXT: ret void |
| ; |
| store i32 0, ptr %P |
| br i1 true, label %bb1, label %bb2 |
| bb1: |
| br label %bb3 |
| bb2: |
| call void @fn_mayread_or_clobber() |
| ret void |
| bb3: |
| store i32 0, ptr %P |
| ret void |
| } |
| |
| ; The store in bb3 can be eliminated, because the store in bb1 cannot alias it. |
| define void @test10(ptr noalias %P, ptr %Q, i1 %c) { |
| ; UNOPT-LABEL: @test10( |
| ; UNOPT-NEXT: store i32 0, ptr [[P:%.*]], align 4 |
| ; UNOPT-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; UNOPT: bb1: |
| ; UNOPT-NEXT: store i32 10, ptr [[Q:%.*]], align 4 |
| ; UNOPT-NEXT: br label [[BB3:%.*]] |
| ; UNOPT: bb2: |
| ; UNOPT-NEXT: ret void |
| ; UNOPT: bb3: |
| ; UNOPT-NEXT: store i32 0, ptr [[P]], align 4 |
| ; UNOPT-NEXT: ret void |
| ; |
| ; OPT-LABEL: @test10( |
| ; OPT-NEXT: store i32 0, ptr [[P:%.*]], align 4 |
| ; OPT-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; OPT: bb1: |
| ; OPT-NEXT: store i32 10, ptr [[Q:%.*]], align 4 |
| ; OPT-NEXT: br label [[BB3:%.*]] |
| ; OPT: bb2: |
| ; OPT-NEXT: ret void |
| ; OPT: bb3: |
| ; OPT-NEXT: ret void |
| ; |
| store i32 0, ptr %P |
| br i1 %c, label %bb1, label %bb2 |
| |
| bb1: |
| store i32 10, ptr %Q |
| br label %bb3 |
| |
| bb2: |
| ret void |
| |
| bb3: |
| store i32 0, ptr %P |
| ret void |
| } |
| |
| define void @test11_smaller_later_store(ptr noalias %P, ptr %Q, i1 %c) { |
| ; CHECK-LABEL: @test11_smaller_later_store( |
| ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[BB3:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: ret void |
| ; CHECK: bb3: |
| ; CHECK-NEXT: store i8 0, ptr [[P]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| store i32 0, ptr %P |
| br i1 %c, label %bb1, label %bb2 |
| |
| bb1: |
| br label %bb3 |
| |
| bb2: |
| ret void |
| |
| bb3: |
| store i8 0, ptr %P |
| ret void |
| } |
| |
| define void @test11_smaller_earlier_store(ptr noalias %P, ptr %Q, i1 %c) { |
| ; CHECK-LABEL: @test11_smaller_earlier_store( |
| ; CHECK-NEXT: store i8 0, ptr [[P:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[BB3:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: ret void |
| ; CHECK: bb3: |
| ; CHECK-NEXT: store i32 0, ptr [[P]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| store i8 0, ptr %P |
| br i1 %c, label %bb1, label %bb2 |
| |
| bb1: |
| br label %bb3 |
| |
| bb2: |
| ret void |
| |
| bb3: |
| store i32 0, ptr %P |
| ret void |
| } |
| |
| declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1 |
| |
| define void @test12_memset_simple(ptr %ptr) { |
| ; CHECK-LABEL: @test12_memset_simple( |
| ; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr [[PTR:%.*]], i8 0, i64 10, i1 false) |
| ; CHECK-NEXT: ret void |
| ; |
| call void @llvm.memset.p0.i64(ptr %ptr, i8 0, i64 10, i1 false) |
| %ptr.5 = getelementptr i8, ptr %ptr, i64 4 |
| store i8 0, ptr %ptr.5 |
| ret void |
| } |
| |
| define void @test12_memset_other_store_in_between(ptr %ptr) { |
| ; UNOPT-LABEL: @test12_memset_other_store_in_between( |
| ; UNOPT-NEXT: call void @llvm.memset.p0.i64(ptr [[PTR:%.*]], i8 0, i64 10, i1 false) |
| ; UNOPT-NEXT: [[PTR_4:%.*]] = getelementptr i8, ptr [[PTR]], i64 4 |
| ; UNOPT-NEXT: store i8 8, ptr [[PTR_4]], align 1 |
| ; UNOPT-NEXT: [[PTR_5:%.*]] = getelementptr i8, ptr [[PTR]], i64 5 |
| ; UNOPT-NEXT: store i8 0, ptr [[PTR_5]], align 1 |
| ; UNOPT-NEXT: ret void |
| ; |
| ; OPT-LABEL: @test12_memset_other_store_in_between( |
| ; OPT-NEXT: call void @llvm.memset.p0.i64(ptr [[PTR:%.*]], i8 0, i64 10, i1 false) |
| ; OPT-NEXT: [[PTR_4:%.*]] = getelementptr i8, ptr [[PTR]], i64 4 |
| ; OPT-NEXT: store i8 8, ptr [[PTR_4]], align 1 |
| ; OPT-NEXT: ret void |
| ; |
| call void @llvm.memset.p0.i64(ptr %ptr, i8 0, i64 10, i1 false) |
| %ptr.4 = getelementptr i8, ptr %ptr, i64 4 |
| store i8 8, ptr %ptr.4 |
| %ptr.5 = getelementptr i8, ptr %ptr, i64 5 |
| store i8 0, ptr %ptr.5 |
| ret void |
| } |
| |
| declare ptr @__memset_chk(ptr writeonly, i32, i64, i64) argmemonly writeonly nofree nounwind |
| |
| define void @test12_memset_chk_other_store_in_between(ptr %ptr) { |
| ; CHECK-LABEL: @test12_memset_chk_other_store_in_between( |
| ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__memset_chk(ptr [[PTR:%.*]], i32 0, i64 10, i64 -1) |
| ; CHECK-NEXT: [[PTR_4:%.*]] = getelementptr i8, ptr [[PTR]], i64 4 |
| ; CHECK-NEXT: store i8 8, ptr [[PTR_4]], align 1 |
| ; CHECK-NEXT: [[PTR_5:%.*]] = getelementptr i8, ptr [[PTR]], i64 5 |
| ; CHECK-NEXT: store i8 0, ptr [[PTR_5]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| %call = tail call ptr @__memset_chk(ptr %ptr, i32 0, i64 10, i64 -1) |
| %ptr.4 = getelementptr i8, ptr %ptr, i64 4 |
| store i8 8, ptr %ptr.4 |
| %ptr.5 = getelementptr i8, ptr %ptr, i64 5 |
| store i8 0, ptr %ptr.5 |
| ret void |
| } |
| |
| declare void @use(ptr) |
| |
| define void @test12_memset_chk_other_store_in_between_stack_obj_escape_after(i64 %n) { |
| ; CHECK-LABEL: @test12_memset_chk_other_store_in_between_stack_obj_escape_after( |
| ; CHECK-NEXT: [[OBJ:%.*]] = alloca [200 x i8], align 1 |
| ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__memset_chk(ptr [[OBJ]], i32 0, i64 10, i64 [[N:%.*]]) |
| ; CHECK-NEXT: [[PTR_4:%.*]] = getelementptr i8, ptr [[OBJ]], i64 4 |
| ; CHECK-NEXT: store i8 8, ptr [[PTR_4]], align 1 |
| ; CHECK-NEXT: [[PTR_5:%.*]] = getelementptr i8, ptr [[OBJ]], i64 5 |
| ; CHECK-NEXT: store i8 0, ptr [[PTR_5]], align 1 |
| ; CHECK-NEXT: call void @use(ptr [[OBJ]]) |
| ; CHECK-NEXT: ret void |
| ; |
| %obj = alloca [200 x i8] |
| %call = tail call ptr @__memset_chk(ptr %obj, i32 0, i64 10, i64 %n) |
| %ptr.4 = getelementptr i8, ptr %obj, i64 4 |
| store i8 8, ptr %ptr.4 |
| %ptr.5 = getelementptr i8, ptr %obj, i64 5 |
| store i8 0, ptr %ptr.5 |
| call void @use(ptr %obj) |
| ret void |
| } |
| |
| define void @test12_memset_chk_other_store_in_between_stack_obj_escape_before(i64 %n) { |
| ; CHECK-LABEL: @test12_memset_chk_other_store_in_between_stack_obj_escape_before( |
| ; CHECK-NEXT: [[OBJ:%.*]] = alloca [200 x i8], align 1 |
| ; CHECK-NEXT: call void @use(ptr [[OBJ]]) |
| ; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__memset_chk(ptr [[OBJ]], i32 0, i64 10, i64 [[N:%.*]]) |
| ; CHECK-NEXT: [[PTR_4:%.*]] = getelementptr i8, ptr [[OBJ]], i64 4 |
| ; CHECK-NEXT: store i8 8, ptr [[PTR_4]], align 1 |
| ; CHECK-NEXT: [[PTR_5:%.*]] = getelementptr i8, ptr [[OBJ]], i64 5 |
| ; CHECK-NEXT: store i8 0, ptr [[PTR_5]], align 1 |
| ; CHECK-NEXT: [[PTR_10:%.*]] = getelementptr i8, ptr [[OBJ]], i64 10 |
| ; CHECK-NEXT: store i8 0, ptr [[PTR_10]], align 1 |
| ; CHECK-NEXT: call void @use(ptr [[OBJ]]) |
| ; CHECK-NEXT: ret void |
| ; |
| %obj = alloca [200 x i8] |
| call void @use(ptr %obj) |
| %call = tail call ptr @__memset_chk(ptr %obj, i32 0, i64 10, i64 %n) |
| %ptr.4 = getelementptr i8, ptr %obj, i64 4 |
| store i8 8, ptr %ptr.4 |
| %ptr.5 = getelementptr i8, ptr %obj, i64 5 |
| store i8 0, ptr %ptr.5 |
| %ptr.10 = getelementptr i8, ptr %obj, i64 10 |
| store i8 0, ptr %ptr.10 |
| call void @use(ptr %obj) |
| ret void |
| } |
| |
| define void @test12_memset_other_store_in_between_partial_overlap(ptr %ptr) { |
| ; CHECK-LABEL: @test12_memset_other_store_in_between_partial_overlap( |
| ; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr [[PTR:%.*]], i8 0, i64 10, i1 false) |
| ; CHECK-NEXT: [[PTR_4:%.*]] = getelementptr i8, ptr [[PTR]], i64 4 |
| ; CHECK-NEXT: store i16 8, ptr [[PTR_4]], align 2 |
| ; CHECK-NEXT: [[PTR_5:%.*]] = getelementptr i8, ptr [[PTR]], i64 5 |
| ; CHECK-NEXT: store i16 0, ptr [[PTR_5]], align 2 |
| ; CHECK-NEXT: ret void |
| ; |
| call void @llvm.memset.p0.i64(ptr %ptr, i8 0, i64 10, i1 false) |
| %ptr.4 = getelementptr i8, ptr %ptr, i64 4 |
| store i16 8, ptr %ptr.4 |
| %ptr.5 = getelementptr i8, ptr %ptr, i64 5 |
| store i16 0, ptr %ptr.5 |
| ret void |
| } |
| |
| define void @test12_memset_later_store_exceeds_memset(ptr %ptr) { |
| ; CHECK-LABEL: @test12_memset_later_store_exceeds_memset( |
| ; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[PTR:%.*]], i8 0, i64 8, i1 false) |
| ; CHECK-NEXT: [[PTR_4:%.*]] = getelementptr i8, ptr [[PTR]], i64 4 |
| ; CHECK-NEXT: store i8 8, ptr [[PTR_4]], align 1 |
| ; CHECK-NEXT: [[PTR_5:%.*]] = getelementptr i8, ptr [[PTR]], i64 8 |
| ; CHECK-NEXT: store i64 0, ptr [[PTR_5]], align 8 |
| ; CHECK-NEXT: ret void |
| ; |
| call void @llvm.memset.p0.i64(ptr %ptr, i8 0, i64 10, i1 false) |
| %ptr.4 = getelementptr i8, ptr %ptr, i64 4 |
| store i8 8, ptr %ptr.4 |
| %ptr.5 = getelementptr i8, ptr %ptr, i64 8 |
| store i64 0, ptr %ptr.5 |
| ret void |
| } |
| |
| define void @test12_memset_later_store_before_memset(ptr %ptr) { |
| ; CHECK-LABEL: @test12_memset_later_store_before_memset( |
| ; CHECK-NEXT: [[PTR_1:%.*]] = getelementptr i8, ptr [[PTR:%.*]], i64 1 |
| ; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[PTR_1]], i64 7 |
| ; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP1]], i8 0, i64 3, i1 false) |
| ; CHECK-NEXT: store i64 0, ptr [[PTR]], align 8 |
| ; CHECK-NEXT: ret void |
| ; |
| %ptr.1 = getelementptr i8, ptr %ptr, i64 1 |
| call void @llvm.memset.p0.i64(ptr %ptr.1, i8 0, i64 10, i1 false) |
| %ptr.4 = getelementptr i8, ptr %ptr, i64 4 |
| store i8 8, ptr %ptr.4 |
| store i64 0, ptr %ptr |
| ret void |
| } |
| |
| ; The memset will be shortened and the store will not be redundant afterwards. |
| ; It cannot be eliminated. |
| define void @test13_memset_shortened(ptr %ptr) { |
| ; CHECK-LABEL: @test13_memset_shortened( |
| ; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[PTR:%.*]], i64 8 |
| ; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP1]], i8 0, i64 16, i1 false) |
| ; CHECK-NEXT: store i64 0, ptr [[PTR]], align 8 |
| ; CHECK-NEXT: ret void |
| ; |
| call void @llvm.memset.p0.i64(ptr %ptr, i8 0, i64 24, i1 false) |
| store i64 0, ptr %ptr |
| ret void |
| } |
| |
| declare ptr @strcat(ptr, ptr) nounwind argmemonly |
| |
| define void @test14_strcat(ptr noalias %P, ptr noalias %Q) { |
| ; CHECK-LABEL: @test14_strcat( |
| ; CHECK-NEXT: [[CALL1:%.*]] = call ptr @strcat(ptr [[P:%.*]], ptr [[Q:%.*]]) |
| ; CHECK-NEXT: [[CALL2:%.*]] = call ptr @strcat(ptr [[P]], ptr [[Q]]) |
| ; CHECK-NEXT: ret void |
| ; |
| %call1 = call ptr @strcat(ptr %P, ptr %Q) |
| ; FIXME: Eliminate the second strcat as a "store of existing value" for this particular case, where both strcat's are identical (same source, not just same dest). |
| %call2 = call ptr @strcat(ptr %P, ptr %Q) |
| ret void |
| } |
| |
| define void @pr49927(ptr %q, ptr %p) { |
| ; CHECK-LABEL: @pr49927( |
| ; CHECK-NEXT: [[V:%.*]] = load i32, ptr [[P:%.*]], align 4 |
| ; CHECK-NEXT: store i32 [[V]], ptr [[Q:%.*]], align 4 |
| ; CHECK-NEXT: store i32 [[V]], ptr [[P]], align 4 |
| ; CHECK-NEXT: ret void |
| ; |
| %v = load i32, ptr %p, align 4 |
| store i32 %v, ptr %q, align 4 |
| store i32 %v, ptr %p, align 4 |
| ret void |
| } |
| |
| define void @pr50339(ptr nocapture readonly %0) { |
| ; CHECK-LABEL: @pr50339( |
| ; CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) @a, ptr noundef nonnull align 1 dereferenceable(16) [[TMP0:%.*]], i64 16, i1 false) |
| ; CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) @a, ptr noundef nonnull align 1 dereferenceable(16) [[TMP0]], i64 16, i1 false) |
| ; CHECK-NEXT: ret void |
| ; |
| tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) @a, ptr noundef nonnull align 1 dereferenceable(16) %0, i64 16, i1 false) |
| ; FIXME: Eliminate the second memcpy as a "store of existing value" for this particular case, where both memcpy's are identical (same source, not just same dest). |
| tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 16 dereferenceable(16) @a, ptr noundef nonnull align 1 dereferenceable(16) %0, i64 16, i1 false) |
| ret void |
| } |
| |
| ; Cannot remove the second memcpy as redundant store, because %src is modified |
| ; in between. |
| define i8 @memset_optimized_access(ptr noalias %dst, ptr noalias %src) { |
| ; CHECK-LABEL: @memset_optimized_access( |
| ; CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i64(ptr [[DST:%.*]], ptr [[SRC:%.*]], i64 16, i1 false) |
| ; CHECK-NEXT: store i8 99, ptr [[SRC]], align 1 |
| ; CHECK-NEXT: [[L:%.*]] = load i8, ptr [[DST]], align 1 |
| ; CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i64(ptr [[DST]], ptr [[SRC]], i64 16, i1 false) |
| ; CHECK-NEXT: ret i8 [[L]] |
| ; |
| tail call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %src, i64 16, i1 false) |
| store i8 99, ptr %src |
| %l = load i8, ptr %dst |
| tail call void @llvm.memcpy.p0.p0.i64(ptr %dst, ptr %src, i64 16, i1 false) |
| ret i8 %l |
| } |
| |
| ; The @use() call is a later non-removable store, but should not affect the |
| ; removal of the store in the if block. |
| define void @later_non_removable_store(i1 %c, ptr %p) { |
| ; CHECK-LABEL: @later_non_removable_store( |
| ; CHECK-NEXT: store i8 1, ptr [[P:%.*]], align 1 |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[EXIT:%.*]] |
| ; CHECK: if: |
| ; CHECK-NEXT: br label [[EXIT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: call void @use(ptr [[P]]) #[[ATTR6:[0-9]+]] |
| ; CHECK-NEXT: ret void |
| ; |
| store i8 1, ptr %p |
| br i1 %c, label %if, label %exit |
| |
| if: |
| store i8 1, ptr %p |
| br label %exit |
| |
| exit: |
| call void @use(ptr %p) argmemonly |
| ret void |
| } |
