diff options
| author | Ulrich Weigand <ulrich.weigand@de.ibm.com> | 2012-11-13 18:40:58 +0000 |
|---|---|---|
| committer | Ulrich Weigand <ulrich.weigand@de.ibm.com> | 2012-11-13 18:40:58 +0000 |
| commit | b64e2115de3b293ef706b75f040277477c949208 (patch) | |
| tree | 02290b789956eaf291cce86fad38cc7c22df9aa5 /test/CodeGen/PowerPC/2012-10-11-dynalloc.ll | |
| parent | 206252cc9f5509b27aa0761c677fdee8daff001c (diff) | |
| download | external_llvm-b64e2115de3b293ef706b75f040277477c949208.zip external_llvm-b64e2115de3b293ef706b75f040277477c949208.tar.gz external_llvm-b64e2115de3b293ef706b75f040277477c949208.tar.bz2 | |
Do not consider a machine instruction that uses and defines the same
physical register as candidate for common subexpression elimination
in MachineCSE.
This fixes a bug on PowerPC in MultiSource/Applications/oggenc/oggenc
caused by MachineCSE invalidly merging two separate DYNALLOC insns.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167855 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/PowerPC/2012-10-11-dynalloc.ll')
| -rw-r--r-- | test/CodeGen/PowerPC/2012-10-11-dynalloc.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/CodeGen/PowerPC/2012-10-11-dynalloc.ll b/test/CodeGen/PowerPC/2012-10-11-dynalloc.ll new file mode 100644 index 0000000..41533a8 --- /dev/null +++ b/test/CodeGen/PowerPC/2012-10-11-dynalloc.ll @@ -0,0 +1,18 @@ +; RUN: llc < %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-v128:128:128-n32:64" +target triple = "powerpc64-unknown-linux-gnu" + +define void @test(i64 %n) nounwind { +entry: + %0 = alloca i8, i64 %n, align 1 + %1 = alloca i8, i64 %n, align 1 + call void @use(i8* %0, i8* %1) nounwind + ret void +} + +declare void @use(i8*, i8*) + +; Check we actually have two instances of dynamic stack allocation, +; identified by the stdux used to update the back-chain link. +; CHECK: stdux +; CHECK: stdux |