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reenable the piece that turns trunc(zext(x)) -> x even if zext has multiple uses,

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codegen has no apparent problem with the trunc version of this, because it turns
into a simple subreg idiom


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93202 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-11 22:49:40 +00:00
parent a958cbfe36
commit 53af2d13e7
1 changed files with 1 additions and 3 deletions
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4
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -327,9 +327,7 @@ static bool CanEvaluateTruncated(Value *V, const Type *Ty) {
// If this is an extension from the dest type, we can eliminate it, even if it
// has multiple uses.
// FIXME: This is currently disabled until codegen can handle this without
// pessimizing code, PR5997.
if (0 && (isa<ZExtInst>(I) || isa<SExtInst>(I)) &&
if ((isa<ZExtInst>(I) || isa<SExtInst>(I)) &&
I->getOperand(0)->getType() == Ty)
return true;