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fold compare of null pointer into compare with 0.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57553 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-10-15 05:18:04 +00:00
parent 160f6cc209
commit d53886bb48
1 changed files with 4 additions and 0 deletions
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4
lib/Target/X86/X86FastISel.cpp
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@ -549,6 +549,10 @@ bool X86FastISel::X86FastEmitCompare(Value *Op0, Value *Op1, MVT VT) {
unsigned Op0Reg = getRegForValue(Op0);
if (Op0Reg == 0) return false;
// Handle 'null' like i32/i64 0.
if (isa<ConstantPointerNull>(Op1))
Op1 = Constant::getNullValue(TD.getIntPtrType());
// We have two options: compare with register or immediate. If the RHS of
// the compare is an immediate that we can fold into this compare, use
// CMPri, otherwise use CMPrr.