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Disable big-endian constant store merges from rL354676.

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llvm-svn: 354677
This commit is contained in:
Nirav Dave 2019-02-22 16:20:34 +00:00
parent d420dee807
commit 2f6186d4a3
2 changed files with 18 additions and 15 deletions
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21
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -15450,16 +15450,17 @@ SDValue DAGCombiner::visitSTORE(SDNode *N) {
if (auto *C = dyn_cast<ConstantSDNode>(Value)) {
APInt Val = C1->getAPIntValue();
APInt InsertVal = C->getAPIntValue().zextOrTrunc(STByteSize * 8);
if (DAG.getDataLayout().isBigEndian())
Offset = ChainByteSize - 1 - Offset;
Val.insertBits(InsertVal, Offset * 8);
SDValue NewSDVal =
DAG.getConstant(Val, SDLoc(C), ChainValue.getValueType(),
C1->isTargetOpcode(), C1->isOpaque());
SDNode *NewST1 = DAG.UpdateNodeOperands(
ST1, ST1->getChain(), NewSDVal, ST1->getOperand(2),
ST1->getOperand(3));
return CombineTo(ST, SDValue(NewST1, 0));
// FIXME: Handle Big-endian mode.
if (!DAG.getDataLayout().isBigEndian()) {
Val.insertBits(InsertVal, Offset * 8);
SDValue NewSDVal =
DAG.getConstant(Val, SDLoc(C), ChainValue.getValueType(),
C1->isTargetOpcode(), C1->isOpaque());
SDNode *NewST1 = DAG.UpdateNodeOperands(
ST1, ST1->getChain(), NewSDVal, ST1->getOperand(2),
ST1->getOperand(3));
return CombineTo(ST, SDValue(NewST1, 0));
}
}
}
} // End ST subset of ST1 case.

12
test/CodeGen/PowerPC/constant-combines.ll
View File

@ -1,13 +1,14 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -o - %s | FileCheck --check-prefix=BE %s
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -o - %s | FileCheck --check-prefix=BE %s
; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -o - %s | FileCheck --check-prefix=LE %s
define void @fold_constant_stores_loaddr(i8* %i8_ptr) {
; BE-LABEL: fold_constant_stores_loaddr:
; BE: # %bb.0: # %entry
; BE-NEXT: li 4, 85
; BE-NEXT: sldi 4, 4, 57
; BE-NEXT: li 4, 0
; BE-NEXT: std 4, 0(3)
; BE-NEXT: li 4, -86
; BE-NEXT: stb 4, 0(3)
; BE-NEXT: blr
;
; LE-LABEL: fold_constant_stores_loaddr:
@ -26,9 +27,10 @@ entry:
define void @fold_constant_stores_hiaddr(i8* %i8_ptr) {
; BE-LABEL: fold_constant_stores_hiaddr:
; BE: # %bb.0: # %entry
; BE-NEXT: li 4, 85
; BE-NEXT: sldi 4, 4, 57
; BE-NEXT: li 4, 0
; BE-NEXT: std 4, 0(3)
; BE-NEXT: li 4, -86
; BE-NEXT: stb 4, 0(3)
; BE-NEXT: blr
;
; LE-LABEL: fold_constant_stores_hiaddr: