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Add ISD::FROUND for libm round()

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All libm floating-point rounding functions, except for round(), had their own
ISD nodes. Recent PowerPC cores have an instruction for round(), and so here I'm
adding ISD::FROUND so that round() can be custom lowered as well.

For the most part, this is straightforward. I've added an intrinsic
and a matching ISD node just like those for nearbyint() and friends. The
SelectionDAG pattern I've named frnd (because ISD::FP_ROUND has already claimed
fround).

This will be used by the PowerPC backend in a follow-up commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187926 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2013-08-07 22:49:12 +00:00
parent 6fa33f5dd9
commit 41418d17cc
19 changed files with 168 additions and 3 deletions
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10
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@@ -4902,7 +4902,8 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
case Intrinsic::ceil:
case Intrinsic::trunc:
case Intrinsic::rint:
case Intrinsic::nearbyint: {
case Intrinsic::nearbyint:
case Intrinsic::round: {
unsigned Opcode;
switch (Intrinsic) {
default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
@@ -4915,6 +4916,7 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
case Intrinsic::trunc: Opcode = ISD::FTRUNC; break;
case Intrinsic::rint: Opcode = ISD::FRINT; break;
case Intrinsic::nearbyint: Opcode = ISD::FNEARBYINT; break;
case Intrinsic::round: Opcode = ISD::FROUND; break;
}
setValue(&I, DAG.getNode(Opcode, sdl,
@@ -5644,6 +5646,12 @@ void SelectionDAGBuilder::visitCall(const CallInst &I) {
if (visitUnaryFloatCall(I, ISD::FRINT))
return;
break;
case LibFunc::round:
case LibFunc::roundf:
case LibFunc::roundl:
if (visitUnaryFloatCall(I, ISD::FROUND))
return;
break;
case LibFunc::trunc:
case LibFunc::truncf:
case LibFunc::truncl: