6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-25 13:24:46 +00:00
Code Issues Projects Releases Wiki Activity

LoopVectorizer: Preserve fast-math flags

Browse Source 
Fixes PR19045.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203008 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2014-03-05 21:10:47 +00:00
parent fc5436c951
commit 9d84b4d70c
3 changed files with 48 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
lib/Transforms/Vectorize/LoopVectorize.cpp
View File

@@ -2489,6 +2489,16 @@ static void cse(SmallVector<BasicBlock *, 4> &BBs) {
}
}
/// \brief Adds a 'fast' flag to floating point operations.
static Value *addFastMathFlag(Value *V) {
if (isa<FPMathOperator>(V)){
FastMathFlags Flags;
Flags.setUnsafeAlgebra();
cast<Instruction>(V)->setFastMathFlags(Flags);
}
return V;
}
void InnerLoopVectorizer::vectorizeLoop() {
//===------------------------------------------------===//
//
@@ -2632,9 +2642,10 @@ void InnerLoopVectorizer::vectorizeLoop() {
setDebugLocFromInst(Builder, ReducedPartRdx);
for (unsigned part = 1; part < UF; ++part) {
if (Op != Instruction::ICmp && Op != Instruction::FCmp)
ReducedPartRdx = Builder.CreateBinOp((Instruction::BinaryOps)Op,
RdxParts[part], ReducedPartRdx,
"bin.rdx");
// Floating point operations had to be 'fast' to enable the reduction.
ReducedPartRdx = addFastMathFlag(
Builder.CreateBinOp((Instruction::BinaryOps)Op, RdxParts[part],
ReducedPartRdx, "bin.rdx"));
else
ReducedPartRdx = createMinMaxOp(Builder, RdxDesc.MinMaxKind,
ReducedPartRdx, RdxParts[part]);
@@ -2664,8 +2675,9 @@ void InnerLoopVectorizer::vectorizeLoop() {
"rdx.shuf");
if (Op != Instruction::ICmp && Op != Instruction::FCmp)
TmpVec = Builder.CreateBinOp((Instruction::BinaryOps)Op, TmpVec, Shuf,
"bin.rdx");
// Floating point operations had to be 'fast' to enable the reduction.
TmpVec = addFastMathFlag(Builder.CreateBinOp(
(Instruction::BinaryOps)Op, TmpVec, Shuf, "bin.rdx"));
else
TmpVec = createMinMaxOp(Builder, RdxDesc.MinMaxKind, TmpVec, Shuf);
}
@@ -2999,6 +3011,10 @@ void InnerLoopVectorizer::vectorizeBlockInLoop(BasicBlock *BB, PhiVector *PV) {
if (VecOp && isa<PossiblyExactOperator>(VecOp))
VecOp->setIsExact(BinOp->isExact());
// Copy the fast-math flags.
if (VecOp && isa<FPMathOperator>(V))
VecOp->setFastMathFlags(it->getFastMathFlags());
Entry[Part] = V;
}
break;