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[InstCombine] Use replaceOperand() API in GEP transforms

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To make sure that replaced operands get DCEd. This drops one
iteration from gepphigep.ll, which is still not optimal.

This was the last test case performing more than 3 iterations.

NFC-ish, only worklist order should change.
This commit is contained in:
Nikita Popov 2020-03-28 19:02:48 +01:00
parent b7e2a09400
commit f72f98d666
2 changed files with 5 additions and 6 deletions
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9
lib/Transforms/InstCombine/InstructionCombining.cpp
View File

@ -1996,7 +1996,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
GEP.getParent()->getInstList().insert(
GEP.getParent()->getFirstInsertionPt(), NewGEP);
GEP.setOperand(0, NewGEP);
replaceOperand(GEP, 0, NewGEP);
PtrOp = NewGEP;
}
@ -2096,8 +2096,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// Update the GEP in place if possible.
if (Src->getNumOperands() == 2) {
GEP.setIsInBounds(isMergedGEPInBounds(*Src, *cast<GEPOperator>(&GEP)));
GEP.setOperand(0, Src->getOperand(0));
GEP.setOperand(1, Sum);
replaceOperand(GEP, 0, Src->getOperand(0));
replaceOperand(GEP, 1, Sum);
return &GEP;
}
Indices.append(Src->op_begin()+1, Src->op_end()-1);
@ -2215,9 +2215,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// array. Because the array type is never stepped over (there
// is a leading zero) we can fold the cast into this GEP.
if (StrippedPtrTy->getAddressSpace() == GEP.getAddressSpace()) {
GEP.setOperand(0, StrippedPtr);
GEP.setSourceElementType(XATy);
return &GEP;
return replaceOperand(GEP, 0, StrippedPtr);
}
// Cannot replace the base pointer directly because StrippedPtr's
// address space is different. Instead, create a new GEP followed by

2
test/Transforms/InstCombine/gepphigep.ll
View File

@ -1,4 +1,4 @@
; RUN: opt -instcombine -S < %s | FileCheck %s
; RUN: opt -instcombine -instcombine-infinite-loop-threshold=3 -S < %s | FileCheck %s
%struct1 = type { %struct2*, i32, i32, i32 }
%struct2 = type { i32, i32 }