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Fix a TargetLowering optimization so that it doesn't duplicate

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loads when an input node has multiple uses.

llvm-svn: 68398
This commit is contained in:
Dan Gohman 2009-04-03 20:11:30 +00:00
parent 7c98197368
commit ea48adc739
2 changed files with 17 additions and 0 deletions
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1
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -1464,6 +1464,7 @@ TargetLowering::SimplifySetCC(MVT VT, SDValue N0, SDValue N1,
// in the same partial word, see if we can shorten the load.
if (DCI.isBeforeLegalize() &&
N0.getOpcode() == ISD::AND && C1 == 0 &&
N0.getNode()->hasOneUse() &&
isa<LoadSDNode>(N0.getOperand(0)) &&
N0.getOperand(0).getNode()->hasOneUse() &&
isa<ConstantSDNode>(N0.getOperand(1))) {

16
test/CodeGen/X86/and-su.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llvm-as < %s | llc -march=x86 | grep {(%} | count 1
; Don't duplicate the load.
define fastcc i32 @foo(i32* %p) nounwind {
%t0 = load i32* %p
%t2 = and i32 %t0, 10
%t3 = icmp ne i32 %t2, 0
br i1 %t3, label %bb63, label %bb76
bb63:
ret i32 %t2
bb76:
ret i32 0
}