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| 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 | 3946877f8835b50e67d55f6a807e62a1969e0fc3 (patch) | |
| tree | b79f7b9fc27707ef5214cd33effe70b88041501e /llvm/test | |
| parent | 70b4dcfbcd1f388b8dc8adef8c175a4924fa0121 (diff) | |
| download | bcm5719-llvm-3946877f8835b50e67d55f6a807e62a1969e0fc3.tar.gz bcm5719-llvm-3946877f8835b50e67d55f6a807e62a1969e0fc3.zip | |
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.
llvm-svn: 167855
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/CodeGen/PowerPC/2012-10-11-dynalloc.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/PowerPC/2012-10-11-dynalloc.ll b/llvm/test/CodeGen/PowerPC/2012-10-11-dynalloc.ll new file mode 100644 index 00000000000..41533a8f322 --- /dev/null +++ b/llvm/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 |
