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R600/SI: Add intrinsics for various math instructions.

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These will be used for custom lowering and for library
implementations of various math functions, so it's useful
to expose these as builtins.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211247 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-06-19 01:19:19 +00:00
parent dd8406a6b7
commit d9b35435b8
20 changed files with 393 additions and 32 deletions
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14
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@@ -922,6 +922,20 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
break;
}
case Intrinsic::AMDGPU_rcp: {
if (const ConstantFP *C = dyn_cast<ConstantFP>(II->getArgOperand(0))) {
const APFloat &ArgVal = C->getValueAPF();
APFloat Val(ArgVal.getSemantics(), 1.0);
APFloat::opStatus Status = Val.divide(ArgVal,
APFloat::rmNearestTiesToEven);
// Only do this if it was exact and therefore not dependent on the
// rounding mode.
if (Status == APFloat::opOK)
return ReplaceInstUsesWith(CI, ConstantFP::get(II->getContext(), Val));
}
break;
}
case Intrinsic::stackrestore: {
// If the save is right next to the restore, remove the restore. This can
// happen when variable allocas are DCE'd.