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Fix the predicate which checks for non-sensical formulae which have

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constants in registers which partially cancel out their immediate fields.

llvm-svn: 104088
This commit is contained in:
Dan Gohman 2010-05-18 23:48:08 +00:00
parent 3a470a6b6c
commit d81303e044
1 changed files with 5 additions and 4 deletions
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9
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2572,10 +2572,11 @@ void LSRInstance::GenerateCrossUseConstantOffsets() {
J = NewF.BaseRegs.begin(), JE = NewF.BaseRegs.end();
J != JE; ++J)
if (const SCEVConstant *C = dyn_cast<SCEVConstant>(*J))
if (C->getValue()->getValue().isNegative() !=
(NewF.AM.BaseOffs < 0) &&
C->getValue()->getValue().abs()
.ule(abs64(NewF.AM.BaseOffs)))
if ((C->getValue()->getValue() + NewF.AM.BaseOffs).abs().slt(
abs64(NewF.AM.BaseOffs)) &&
(C->getValue()->getValue() +
NewF.AM.BaseOffs).countTrailingZeros() >=
CountTrailingZeros_64(NewF.AM.BaseOffs))
goto skip_formula;
// Ok, looks good.