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Added a slew of SimplifyInstruction floating-point optimizations, many of which take advantage of fast-math flags. Test cases included.

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fsub X, +0 ==> X
  fsub X, -0 ==> X, when we know X is not -0
  fsub +/-0.0, (fsub -0.0, X) ==> X
  fsub nsz +/-0.0, (fsub +/-0.0, X) ==> X
  fsub nnan ninf X, X ==> 0.0
  fadd nsz X, 0 ==> X
  fadd [nnan ninf] X, (fsub [nnan ninf] 0, X) ==> 0
    where nnan and ninf have to occur at least once somewhere in this expression
  fmul X, 1.0 ==> X



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169940 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Ilseman
2012-12-12 00:27:46 +00:00
parent 1d4b150704
commit 09ee250e72
4 changed files with 230 additions and 10 deletions
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14
include/llvm/Analysis/InstructionSimplify.h
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@ -44,6 +44,20 @@ namespace llvm {
const TargetLibraryInfo *TLI = 0,
const DominatorTree *DT = 0);
/// Given operands for an FAdd, see if we can fold the result. If not, this
/// returns null.
Value *SimplifyFAddInst(Value *LHS, Value *RHS, FastMathFlags FMF,
const DataLayout *TD = 0,
const TargetLibraryInfo *TLI = 0,
const DominatorTree *DT = 0);
/// Given operands for an FSub, see if we can fold the result. If not, this
/// returns null.
Value *SimplifyFSubInst(Value *LHS, Value *RHS, FastMathFlags FMF,
const DataLayout *TD = 0,
const TargetLibraryInfo *TLI = 0,
const DominatorTree *DT = 0);
/// Given operands for an FMul, see if we can fold the result. If not, this
/// returns null.
Value *SimplifyFMulInst(Value *LHS, Value *RHS,