diff options
author | Pete Cooper <peter_cooper@apple.com> | 2011-11-03 18:01:56 +0000 |
---|---|---|
committer | Pete Cooper <peter_cooper@apple.com> | 2011-11-03 18:01:56 +0000 |
commit | 2d32b86543aa857a07371a93766652510f1cc0d6 (patch) | |
tree | a6610d3deba36e35673c1730f113d29f704570bd /test/Transforms/DeadStoreElimination | |
parent | fb6d79a58e710b3b4aef34ecacc28603b6d5042e (diff) | |
download | external_llvm-2d32b86543aa857a07371a93766652510f1cc0d6.zip external_llvm-2d32b86543aa857a07371a93766652510f1cc0d6.tar.gz external_llvm-2d32b86543aa857a07371a93766652510f1cc0d6.tar.bz2 |
DeadStoreElimination can now trim the size of a store if the end of it is dead.
Only currently done if the later store is writing to a power of 2 address or
has the same alignment as the earlier store as then its likely to not break up
large stores into smaller ones
Fixes <rdar://problem/10140300>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143630 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/DeadStoreElimination')
-rw-r--r-- | test/Transforms/DeadStoreElimination/OverwriteStoreEnd.ll | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/test/Transforms/DeadStoreElimination/OverwriteStoreEnd.ll b/test/Transforms/DeadStoreElimination/OverwriteStoreEnd.ll new file mode 100644 index 0000000..828ccc5 --- /dev/null +++ b/test/Transforms/DeadStoreElimination/OverwriteStoreEnd.ll @@ -0,0 +1,78 @@ +; 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 @write24to28(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @write24to28 +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 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 7 + store i32 1, i32* %arrayidx1, align 4 + ret void +} + +define void @write28to32(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @write28to32 +entry: + %p3 = bitcast i32* %p 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 32, i32 4, i1 false) + %arrayidx1 = getelementptr inbounds i32* %p, i64 7 + store i32 1, i32* %arrayidx1, align 4 + ret void +} + +define void @dontwrite28to32memset(i32* nocapture %p) nounwind uwtable ssp { +; CHECK: @dontwrite28to32memset +entry: + %p3 = bitcast i32* %p to i8* +; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 16, i1 false) + call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 16, i1 false) + %arrayidx1 = getelementptr inbounds i32* %p, i64 7 + store i32 1, i32* %arrayidx1, align 4 + ret void +} + +define void @write32to36(%struct.vec2plusi* nocapture %p) nounwind uwtable ssp { +; CHECK: @write32to36 +entry: + %0 = bitcast %struct.vec2plusi* %p to i8* +; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2plusi* @glob2 to i8*), i64 32, i32 16, i1 false) + tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2plusi* @glob2 to i8*), i64 36, i32 16, i1 false) + %c = getelementptr inbounds %struct.vec2plusi* %p, i64 0, i32 2 + store i32 1, i32* %c, align 4 + ret void +} + +define void @write16to32(%struct.vec2* nocapture %p) nounwind uwtable ssp { +; CHECK: @write16to32 +entry: + %0 = bitcast %struct.vec2* %p to i8* +; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 16, i32 16, i1 false) + tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 32, i32 16, i1 false) + %c = getelementptr inbounds %struct.vec2* %p, i64 0, i32 1 + store <4 x i32> <i32 1, i32 2, i32 3, i32 4>, <4 x i32>* %c, align 4 + ret void +} + +define void @dontwrite28to32memcpy(%struct.vec2* nocapture %p) nounwind uwtable ssp { +; CHECK: @dontwrite28to32memcpy +entry: + %0 = bitcast %struct.vec2* %p to i8* +; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 32, i32 16, i1 false) + tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.vec2* @glob1 to i8*), i64 32, i32 16, i1 false) + %arrayidx1 = getelementptr inbounds %struct.vec2* %p, i64 0, i32 0, i64 7 + store i32 1, i32* %arrayidx1, align 4 + ret void +} + +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 |