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Treat TargetGlobalAddress as a constant for the purpose of matching pre-inc stores on PPC.

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Thanks to Tobias von Koch for pointing out this problem.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158932 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-06-21 20:10:48 +00:00
parent 343c32a39c
commit 2bbc9193b4
2 changed files with 28 additions and 1 deletions
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7
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -111,7 +111,8 @@ namespace {
/// immediate field. Because preinc imms have already been validated, just
/// accept it.
bool SelectAddrImmOffs(SDValue N, SDValue &Out) const {
if (isa<ConstantSDNode>(N)) {
if (isa<ConstantSDNode>(N) || N.getOpcode() == PPCISD::Lo ||
N.getOpcode() == ISD::TargetGlobalAddress) {
Out = N;
return true;
}
@ -123,6 +124,10 @@ namespace {
/// index field. Because preinc imms have already been validated, just
/// accept it.
bool SelectAddrIdxOffs(SDValue N, SDValue &Out) const {
if (isa<ConstantSDNode>(N) || N.getOpcode() == PPCISD::Lo ||
N.getOpcode() == ISD::TargetGlobalAddress)
return false;
Out = N;
return true;
}

22
test/CodeGen/PowerPC/stwu-gta.ll Normal file
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@ -0,0 +1,22 @@
target datalayout = "E-p:32:32:32-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"
target triple = "powerpc-unknown-linux"
; RUN: llc < %s | FileCheck %s
%class.Two.0.5 = type { i32, i32, i32 }
@foo = external global %class.Two.0.5, align 4
define void @_GLOBAL__I_a() nounwind section ".text.startup" {
entry:
store i32 5, i32* getelementptr inbounds (%class.Two.0.5* @foo, i32 0, i32 0), align 4, !tbaa !0
store i32 6, i32* getelementptr inbounds (%class.Two.0.5* @foo, i32 0, i32 1), align 4, !tbaa !0
ret void
}
; CHECK: @_GLOBAL__I_a
; CHECK-NOT: stwux
; CHECK: stwu
!0 = metadata !{metadata !"int", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA"}