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Teach ConstantFolding to do a better job when folding gep(bitcast).

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This permits the devirtualization of llvm.org/PR3100#c9 when compiled by clang.

llvm-svn: 90099
This commit is contained in:
Nick Lewycky 2009-11-29 21:40:55 +00:00
parent d9780ec7c5
commit 116b145b02
2 changed files with 2 additions and 1 deletions
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1
lib/Analysis/ConstantFolding.cpp
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@ -564,6 +564,7 @@ static Constant *SymbolicallyEvaluateGEP(Constant *const *Ops, unsigned NumOps,
// we eliminate over-indexing of the notional static type array bounds. // we eliminate over-indexing of the notional static type array bounds.
// This makes it easy to determine if the getelementptr is "inbounds". // This makes it easy to determine if the getelementptr is "inbounds".
// Also, this helps GlobalOpt do SROA on GlobalVariables. // Also, this helps GlobalOpt do SROA on GlobalVariables.
Ptr = cast<Constant>(Ptr->stripPointerCasts());
const Type *Ty = Ptr->getType(); const Type *Ty = Ptr->getType();
SmallVector<Constant*, 32> NewIdxs; SmallVector<Constant*, 32> NewIdxs;
do { do {

2
test/Transforms/InstCombine/getelementptr.ll
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@ -445,7 +445,7 @@ define i32 @test35() nounwind {
i8* getelementptr (%t1* bitcast (%t0* @s to %t1*), i32 0, i32 1, i32 0)) nounwind i8* getelementptr (%t1* bitcast (%t0* @s to %t1*), i32 0, i32 1, i32 0)) nounwind
ret i32 0 ret i32 0
; CHECK: @test35 ; CHECK: @test35
; CHECK: call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([17 x i8]* @"\01LC8", i64 0, i64 0), i8* bitcast (i8** getelementptr (%t1* bitcast (%t0* @s to %t1*), i64 1, i32 0) to i8*)) nounwind ; CHECK: call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([17 x i8]* @"\01LC8", i64 0, i64 0), i8* getelementptr inbounds (%t0* @s, i64 0, i32 1, i64 0)) nounwind
} }
; Instcombine should constant-fold the GEP so that indices that have ; Instcombine should constant-fold the GEP so that indices that have