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| author | Dan Gohman <gohman@apple.com> | 2010-05-18 23:48:08 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-05-18 23:48:08 +0000 |
| commit | 50f8f2c23df7e8d8d2d3189f9943d18064f5fcd3 (patch) | |
| tree | d642cbb6e94b4de1b4b5808239b38764bf10d64f /llvm/lib/Transforms | |
| parent | 4cf99b530376723179253e549158a92d15146caf (diff) | |
| download | bcm5719-llvm-50f8f2c23df7e8d8d2d3189f9943d18064f5fcd3.tar.gz bcm5719-llvm-50f8f2c23df7e8d8d2d3189f9943d18064f5fcd3.zip | |
Fix the predicate which checks for non-sensical formulae which have
constants in registers which partially cancel out their immediate fields.
llvm-svn: 104088
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp index 6bab98bab77..921f0b9638b 100644 --- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -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. |
