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Diffstat (limited to 'test/Transforms/MemCpyOpt/align.ll')
| -rw-r--r-- | test/Transforms/MemCpyOpt/align.ll | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/test/Transforms/MemCpyOpt/align.ll b/test/Transforms/MemCpyOpt/align.ll index b1f900d9da4c..1b98f6ad383f 100644 --- a/test/Transforms/MemCpyOpt/align.ll +++ b/test/Transforms/MemCpyOpt/align.ll @@ -1,12 +1,15 @@ -; RUN: opt < %s -S -memcpyopt | FileCheck %s +; RUN: opt < %s -S -basicaa -memcpyopt | FileCheck %s target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64" +declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind +declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind + ; The resulting memset is only 4-byte aligned, despite containing ; a 16-byte aligned store in the middle. -; CHECK: call void @llvm.memset.p0i8.i64(i8* {{.*}}, i8 0, i64 16, i32 4, i1 false) - define void @foo(i32* %p) { +; CHECK: @foo +; CHECK: call void @llvm.memset.p0i8.i64(i8* {{.*}}, i8 0, i64 16, i32 4, i1 false) %a0 = getelementptr i32* %p, i64 0 store i32 0, i32* %a0, align 4 %a1 = getelementptr i32* %p, i64 1 @@ -17,3 +20,18 @@ define void @foo(i32* %p) { store i32 0, i32* %a3, align 4 ret void } + +; Replacing %a8 with %a4 in the memset requires boosting the alignment of %a4. + +define void @bar() { +; CHECK: @bar +; CHECK: %a4 = alloca i32, align 8 +; CHECK-NOT: memcpy + %a4 = alloca i32, align 4 + %a8 = alloca i32, align 8 + %a8.cast = bitcast i32* %a8 to i8* + %a4.cast = bitcast i32* %a4 to i8* + call void @llvm.memset.p0i8.i64(i8* %a8.cast, i8 0, i64 4, i32 8, i1 false) + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a4.cast, i8* %a8.cast, i64 4, i32 4, i1 false) + ret void +} |