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Add intrinsics for constrained floating point operations

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This commit introduces a set of experimental intrinsics intended to prevent
optimizations that make assumptions about the rounding mode and floating point
exception behavior.  These intrinsics will later be extended to specify
flush-to-zero behavior.  More work is also required to model instruction
dependencies in machine code and to generate these instructions from clang
(when required by pragmas and/or command line options that are not currently
supported).

Differential Revision: https://reviews.llvm.org/D27028

llvm-svn: 293226
This commit is contained in:
Andrew Kaylor
2017-01-26 23:27:59 +00:00
parent 79b733bc6b
commit a0a1164ce4
13 changed files with 768 additions and 0 deletions
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18
llvm/lib/IR/Verifier.cpp
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@@ -457,6 +457,7 @@ private:
void visitUserOp1(Instruction &I);
void visitUserOp2(Instruction &I) { visitUserOp1(I); }
void visitIntrinsicCallSite(Intrinsic::ID ID, CallSite CS);
void visitConstrainedFPIntrinsic(ConstrainedFPIntrinsic &FPI);
template <class DbgIntrinsicTy>
void visitDbgIntrinsic(StringRef Kind, DbgIntrinsicTy &DII);
void visitAtomicCmpXchgInst(AtomicCmpXchgInst &CXI);
@@ -3929,6 +3930,14 @@ void Verifier::visitIntrinsicCallSite(Intrinsic::ID ID, CallSite CS) {
"constant int",
CS);
break;
case Intrinsic::experimental_constrained_fadd:
case Intrinsic::experimental_constrained_fsub:
case Intrinsic::experimental_constrained_fmul:
case Intrinsic::experimental_constrained_fdiv:
case Intrinsic::experimental_constrained_frem:
visitConstrainedFPIntrinsic(
cast<ConstrainedFPIntrinsic>(*CS.getInstruction()));
break;
case Intrinsic::dbg_declare: // llvm.dbg.declare
Assert(isa<MetadataAsValue>(CS.getArgOperand(0)),
"invalid llvm.dbg.declare intrinsic call 1", CS);
@@ -4294,6 +4303,15 @@ static DISubprogram *getSubprogram(Metadata *LocalScope) {
return nullptr;
}
void Verifier::visitConstrainedFPIntrinsic(ConstrainedFPIntrinsic &FPI) {
Assert(isa<MetadataAsValue>(FPI.getOperand(2)),
"invalid rounding mode argument", &FPI);
Assert(FPI.getRoundingMode() != ConstrainedFPIntrinsic::rmInvalid,
"invalid rounding mode argument", &FPI);
Assert(FPI.getExceptionBehavior() != ConstrainedFPIntrinsic::ebInvalid,
"invalid exception behavior argument", &FPI);
}
template <class DbgIntrinsicTy>
void Verifier::visitDbgIntrinsic(StringRef Kind, DbgIntrinsicTy &DII) {
auto *MD = cast<MetadataAsValue>(DII.getArgOperand(0))->getMetadata();