| ; Test that the memset library call simplifier works correctly. |
| ; |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" |
| |
| declare i8* @memset(i8*, i32, i32) |
| |
| ; Check memset(mem1, val, size) -> llvm.memset(mem1, val, size, 1). |
| |
| define i8* @test_simplify1(i8* %mem, i32 %val, i32 %size) { |
| ; CHECK-LABEL: @test_simplify1( |
| %ret = call i8* @memset(i8* %mem, i32 %val, i32 %size) |
| ; CHECK: call void @llvm.memset |
| ret i8* %ret |
| ; CHECK: ret i8* %mem |
| } |
| |
| define i8* @pr25892_lite(i32 %size) #0 { |
| %call1 = call i8* @malloc(i32 %size) #1 |
| %call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1 |
| ret i8* %call2 |
| |
| ; CHECK-LABEL: @pr25892_lite( |
| ; CHECK-NEXT: %calloc = call i8* @calloc(i32 1, i32 %size) |
| ; CHECK-NEXT: ret i8* %calloc |
| } |
| |
| ; FIXME: memset(malloc(x), 0, x) -> calloc(1, x) |
| ; This doesn't fire currently because the malloc has more than one use. |
| |
| define float* @pr25892(i32 %size) #0 { |
| entry: |
| %call = tail call i8* @malloc(i32 %size) #1 |
| %cmp = icmp eq i8* %call, null |
| br i1 %cmp, label %cleanup, label %if.end |
| if.end: |
| %bc = bitcast i8* %call to float* |
| %call2 = tail call i8* @memset(i8* nonnull %call, i32 0, i32 %size) #1 |
| br label %cleanup |
| cleanup: |
| %retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ] |
| ret float* %retval.0 |
| |
| ; CHECK-LABEL: @pr25892( |
| ; CHECK: entry: |
| ; CHECK-NEXT: %call = tail call i8* @malloc(i32 %size) #1 |
| ; CHECK-NEXT: %cmp = icmp eq i8* %call, null |
| ; CHECK-NEXT: br i1 %cmp, label %cleanup, label %if.end |
| ; CHECK: if.end: |
| ; CHECK-NEXT: %bc = bitcast i8* %call to float* |
| ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull %call, i8 0, i32 %size, i32 1, i1 false) |
| ; CHECK-NEXT: br label %cleanup |
| ; CHECK: cleanup: |
| ; CHECK-NEXT: %retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ] |
| ; CHECK-NEXT: ret float* %retval.0 |
| } |
| |
| declare noalias i8* @malloc(i32) #1 |
| declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) #2 |
| |
| attributes #0 = { nounwind ssp uwtable } |
| attributes #1 = { nounwind } |
| attributes #2 = { nounwind readnone } |
| |