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| author | Pete Cooper <peter_cooper@apple.com> | 2012-02-28 04:27:10 +0000 |
|---|---|---|
| committer | Pete Cooper <peter_cooper@apple.com> | 2012-02-28 04:27:10 +0000 |
| commit | a116623e06d0cf833cbefd4921dbca8581f1c806 (patch) | |
| tree | 56e15b35ee336448d6468116838179c24a05e1ad /test | |
| parent | 601c094734cc5920a4e937c74447dd6922770a2d (diff) | |
| download | llvm-a116623e06d0cf833cbefd4921dbca8581f1c806.tar.gz llvm-a116623e06d0cf833cbefd4921dbca8581f1c806.tar.bz2 llvm-a116623e06d0cf833cbefd4921dbca8581f1c806.tar.xz | |
DSE: Shorten memset when a later store overwrites the start of it
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151620 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/DeadStoreElimination/OverwriteStoreStart.ll | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/test/Transforms/DeadStoreElimination/OverwriteStoreStart.ll b/test/Transforms/DeadStoreElimination/OverwriteStoreStart.ll new file mode 100644 index 0000000000..56ba3f4927 --- /dev/null +++ b/test/Transforms/DeadStoreElimination/OverwriteStoreStart.ll @@ -0,0 +1,71 @@ +; RUN: opt < %s -basicaa -dse -S | FileCheck %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" + +%struct.vec2 = type { <4 x i32>, <4 x i32> } +%struct.vec2plusi = type { <4 x i32>, <4 x i32>, i32 } + +@glob1 = global %struct.vec2 zeroinitializer, align 16 +@glob2 = global %struct.vec2plusi zeroinitializer, align 16 + +define void @write4to8(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @write4to8 +entry: + %arrayidx0 = getelementptr inbounds i32* %p, i64 1 + %p3 = bitcast i32* %arrayidx0 to i8* +; CHECK: call void @llvm.memset.p0i8.i64(i8* %{{[0-9]+}}, i8 0, i64 24, i32 4, i1 false) + call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false) + %arrayidx1 = getelementptr inbounds i32* %p, i64 1 + store i32 1, i32* %arrayidx1, align 4 + ret void +} + +define void @write4to12(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @write4to12 +entry: +%arrayidx0 = getelementptr inbounds i32* %p, i64 1 +%p3 = bitcast i32* %arrayidx0 to i8* +; CHECK: call void @llvm.memset.p0i8.i64(i8* %{{[0-9]+}}, i8 0, i64 20, i32 4, i1 false) +call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false) +%arrayidx1 = bitcast i32* %arrayidx0 to i64* +store i64 1, i64* %arrayidx1, align 4 +ret void +} + +define void @write4to8_2(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @write4to8_2 +entry: +%arrayidx0 = getelementptr inbounds i32* %p, i64 1 +%p3 = bitcast i32* %arrayidx0 to i8* +; CHECK: call void @llvm.memset.p0i8.i64(i8* %{{[0-9]+}}, i8 0, i64 24, i32 4, i1 false) +call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false) +%arrayidx1 = bitcast i32* %p to i64* +store i64 1, i64* %arrayidx1, align 4 +ret void +} + +define void @dontwrite4to6(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @dontwrite4to6 +entry: +%arrayidx0 = getelementptr inbounds i32* %p, i64 1 +%p3 = bitcast i32* %arrayidx0 to i8* +; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false) +call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false) +%arrayidx1 = bitcast i32* %arrayidx0 to i16* +store i16 1, i16* %arrayidx1, align 4 +ret void +} + +define void @write4to8_neg_gep(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @write4to8_neg_gep +entry: +%arrayidx0 = getelementptr inbounds i32* %p, i64 -1 +%p3 = bitcast i32* %arrayidx0 to i8* +; CHECK: call void @llvm.memset.p0i8.i64(i8* %{{[0-9]+}}, i8 0, i64 24, i32 4, i1 false) +call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false) +%neg2 = getelementptr inbounds i32* %p, i64 -2 +%arrayidx1 = bitcast i32* %neg2 to i64* +store i64 1, i64* %arrayidx1, align 4 +ret void +} + +declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind |