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author | Chris Lattner <sabre@nondot.org> | 2010-10-08 03:54:52 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2010-10-08 03:54:52 +0000 |
commit | 99ae6659daaebeb32df91653fad09748fda8bcb2 (patch) | |
tree | 45170feaad220191b02a7ad9652f0d392415416e /lib/Target/X86/X86InstrInfo.td | |
parent | 0de25f7b386c00e74a8ab11950e5b966fb67aa88 (diff) | |
download | external_llvm-99ae6659daaebeb32df91653fad09748fda8bcb2.zip external_llvm-99ae6659daaebeb32df91653fad09748fda8bcb2.tar.gz external_llvm-99ae6659daaebeb32df91653fad09748fda8bcb2.tar.bz2 |
reapply the patch reverted in r116033:
"Reimplement (part of) the or -> add optimization. Matching 'or' into 'add'"
With a critical fix: the add pseudos clobber EFLAGS.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116039 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86InstrInfo.td')
-rw-r--r-- | lib/Target/X86/X86InstrInfo.td | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td index c1e15e4..3f420f5 100644 --- a/lib/Target/X86/X86InstrInfo.td +++ b/lib/Target/X86/X86InstrInfo.td @@ -544,20 +544,6 @@ def trunc_su : PatFrag<(ops node:$src), (trunc node:$src), [{ return N->hasOneUse(); }]>; -// Treat an 'or' node is as an 'add' if the or'ed bits are known to be zero. -def or_is_add : PatFrag<(ops node:$lhs, node:$rhs), (or node:$lhs, node:$rhs),[{ - if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1))) - return CurDAG->MaskedValueIsZero(N->getOperand(0), CN->getAPIntValue()); - - unsigned BitWidth = N->getValueType(0).getScalarType().getSizeInBits(); - APInt Mask = APInt::getAllOnesValue(BitWidth); - APInt KnownZero0, KnownOne0; - CurDAG->ComputeMaskedBits(N->getOperand(0), Mask, KnownZero0, KnownOne0, 0); - APInt KnownZero1, KnownOne1; - CurDAG->ComputeMaskedBits(N->getOperand(1), Mask, KnownZero1, KnownOne1, 0); - return (~KnownZero0 & ~KnownZero1) == 0; -}]>; - //===----------------------------------------------------------------------===// // Instruction list. // |