[llvm-branch-commits] [llvm] Bundle operands to specify denormal modes (PR #136501)
Serge Pavlov via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Sun Apr 20 11:12:44 PDT 2025
https://github.com/spavloff created https://github.com/llvm/llvm-project/pull/136501
Two new operands are now supported in the "fp.control" operand bundle:
* "denorm.in=xxx" - specifies the inpot denormal mode.
* "denorm.out=xxx" - specifies the output denormal mode.
Here xxx must be one of the following values:
* "ieee" - preserve denormals.
* "zero" - flush to zero preserving sign.
* "pzero" - flush to positive zero.
* "dyn" - mode is dynamically read from a control register.
These values align those permitted in the "denormal-fp-math" function attribute.
>From 22742e24c1eef3ecc0fb4294dac9f42c9d160019 Mon Sep 17 00:00:00 2001
From: Serge Pavlov <sepavloff at gmail.com>
Date: Thu, 17 Apr 2025 18:42:15 +0700
Subject: [PATCH] Bundle operands to specify denormal modes
Two new operands are now supported in the "fp.control" operand bundle:
* "denorm.in=xxx" - specifies the inpot denormal mode.
* "denorm.out=xxx" - specifies the output denormal mode.
Here xxx must be one of the following values:
* "ieee" - preserve denormals.
* "zero" - flush to zero preserving sign.
* "pzero" - flush to positive zero.
* "dyn" - mode is dynamically read from a control register.
These values align those permitted in the "denormal-fp-math" function
attribute.
---
llvm/docs/LangRef.rst | 18 +-
llvm/include/llvm/ADT/FloatingPointMode.h | 33 ++++
llvm/include/llvm/IR/InstrTypes.h | 21 +++
llvm/lib/Analysis/ConstantFolding.cpp | 24 ++-
llvm/lib/IR/Instructions.cpp | 168 +++++++++++++++++-
llvm/lib/IR/Verifier.cpp | 14 ++
.../constant-fold-fp-denormal-strict.ll | 91 ++++++++++
llvm/test/Verifier/fp-intrinsics.ll | 36 ++++
8 files changed, 394 insertions(+), 11 deletions(-)
create mode 100644 llvm/test/Transforms/InstSimplify/constant-fold-fp-denormal-strict.ll
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 8252971aa8a58..954f0e96b46f6 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -3084,7 +3084,10 @@ floating-point control modes and the treatment of status bits respectively.
An operand bundle tagged with "fp.control" contains information about the
control modes used for the operation execution. Operands specified in this
-bundle represent particular options. Currently, only rounding mode is supported.
+bundle represent particular options. The following modes are supported:
+
+* rounding mode,
+* denormal behavior.
Rounding mode is represented by a metadata string value, which specifies the
the mode used for the operation evaluation. Possible values are:
@@ -3103,6 +3106,19 @@ rounding rounding mode is taken from the control register (dynamic rounding).
In the particular case of :ref:`default floating-point environment <floatenv>`,
the operation uses rounding to nearest, ties to even.
+Denormal behavior defines whether denormal values are flushed to zero during
+the call's execution. This behavior is specified separately for input and
+output values. Such specification is a string, which starts with
+"denorm.in=" or "denorm.out=" respectively. The remainder of the string should
+be one of the values:
+
+::
+
+ ``"ieee"`` - preserve denormals,
+ ``"zero"`` - flush to +0.0 or -0.0 depending on value sign,
+ ``"pzero"`` - flush to +0.0,
+ ``"dyn"`` - concrete mode is read from some register.
+
An operand bundle tagged with "fp.except" may be associated with operations
that can read or write floating-point exception flags. It contains a single
metadata string value, which can have one of the following values:
diff --git a/llvm/include/llvm/ADT/FloatingPointMode.h b/llvm/include/llvm/ADT/FloatingPointMode.h
index 639d931ef88fe..5fceccfd1d0bf 100644
--- a/llvm/include/llvm/ADT/FloatingPointMode.h
+++ b/llvm/include/llvm/ADT/FloatingPointMode.h
@@ -234,6 +234,39 @@ void DenormalMode::print(raw_ostream &OS) const {
OS << denormalModeKindName(Output) << ',' << denormalModeKindName(Input);
}
+/// If the specified string represents denormal mode as used in operand bundles,
+/// returns the corresponding mode.
+inline std::optional<DenormalMode::DenormalModeKind>
+parseDenormalKindFromOperandBundle(StringRef Str) {
+ if (Str == "ieee")
+ return DenormalMode::IEEE;
+ if (Str == "zero")
+ return DenormalMode::PreserveSign;
+ if (Str == "pzero")
+ return DenormalMode::PositiveZero;
+ if (Str == "dyn")
+ return DenormalMode::Dynamic;
+ return std::nullopt;
+}
+
+/// Converts the specified denormal mode into string suitable for use in an
+/// operand bundle.
+inline std::optional<StringRef>
+printDenormalForOperandBundle(DenormalMode::DenormalModeKind Mode) {
+ switch (Mode) {
+ case DenormalMode::IEEE:
+ return "ieee";
+ case DenormalMode::PreserveSign:
+ return "zero";
+ case DenormalMode::PositiveZero:
+ return "pzero";
+ case DenormalMode::Dynamic:
+ return "dyn";
+ default:
+ return std::nullopt;
+ }
+}
+
/// Floating-point class tests, supported by 'is_fpclass' intrinsic. Actual
/// test may be an OR combination of basic tests.
enum FPClassTest : unsigned {
diff --git a/llvm/include/llvm/IR/InstrTypes.h b/llvm/include/llvm/IR/InstrTypes.h
index 8425243e5efe9..8492c911ffc6a 100644
--- a/llvm/include/llvm/IR/InstrTypes.h
+++ b/llvm/include/llvm/IR/InstrTypes.h
@@ -1092,12 +1092,24 @@ template <typename InputTy> class OperandBundleDefT {
using OperandBundleDef = OperandBundleDefT<Value *>;
using ConstOperandBundleDef = OperandBundleDefT<const Value *>;
+std::optional<StringRef> getBundleOperandByPrefix(OperandBundleUse Bundle,
+ StringRef Prefix);
+void addOperandToBundleTag(LLVMContext &Ctx,
+ SmallVectorImpl<OperandBundleDef> &Bundles,
+ StringRef Tag, size_t PrefixSize, StringRef Val);
+
void addFPRoundingBundle(LLVMContext &Ctx,
SmallVectorImpl<OperandBundleDef> &Bundles,
RoundingMode Rounding);
void addFPExceptionBundle(LLVMContext &Ctx,
SmallVectorImpl<OperandBundleDef> &Bundles,
fp::ExceptionBehavior Except);
+void addFPInputDenormBundle(LLVMContext &Ctx,
+ SmallVectorImpl<OperandBundleDef> &Bundles,
+ DenormalMode::DenormalModeKind Mode);
+void addFPOutputDenormBundle(LLVMContext &Ctx,
+ SmallVectorImpl<OperandBundleDef> &Bundles,
+ DenormalMode::DenormalModeKind Mode);
//===----------------------------------------------------------------------===//
// CallBase Class
@@ -2171,6 +2183,15 @@ class CallBase : public Instruction {
/// Return exception behavior specified for this call.
fp::ExceptionBehavior getExceptionBehavior() const;
+ /// Return input denormal mode specified by operand bundles.
+ DenormalMode::DenormalModeKind getInputDenormMode() const;
+
+ /// Return output denormal mode specified by operand bundles.
+ DenormalMode::DenormalModeKind getOutputDenormMode() const;
+
+ /// Return input and output denormal modes specified by operand bundles.
+ DenormalMode getDenormMode() const;
+
/// Used to keep track of an operand bundle. See the main comment on
/// OperandBundleUser above.
struct BundleOpInfo {
diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp
index dc905ab03e861..602aa380fab1f 100644
--- a/llvm/lib/Analysis/ConstantFolding.cpp
+++ b/llvm/lib/Analysis/ConstantFolding.cpp
@@ -1354,6 +1354,11 @@ static ConstantFP *flushDenormalConstantFP(ConstantFP *CFP,
if (!APF.isDenormal())
return CFP;
+ if (auto *CB = dyn_cast<CallBase>(Inst)) {
+ auto Mode = IsOutput ? CB->getOutputDenormMode() : CB->getInputDenormMode();
+ return flushDenormalConstant(CFP->getType(), APF, Mode);
+ }
+
DenormalMode Mode = getInstrDenormalMode(Inst, CFP->getType());
return flushDenormalConstant(CFP->getType(), APF,
IsOutput ? Mode.Output : Mode.Input);
@@ -2976,12 +2981,20 @@ static Constant *ConstantFoldIntrinsicCall2(Intrinsic::ID IntrinsicID, Type *Ty,
}
if (const auto *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
- const APFloat &Op1V = Op1->getValueAPF();
+ ConstantFP *Op1F =
+ flushDenormalConstantFP(const_cast<ConstantFP *>(Op1), Call, false);
+ if (!Op1F)
+ return nullptr;
+ const APFloat &Op1V = Op1F->getValueAPF();
if (const auto *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
if (Op2->getType() != Op1->getType())
return nullptr;
- const APFloat &Op2V = Op2->getValueAPF();
+ ConstantFP *Op2F =
+ flushDenormalConstantFP(const_cast<ConstantFP *>(Op2), Call, false);
+ if (!Op2F)
+ return nullptr;
+ const APFloat &Op2V = Op2F->getValueAPF();
if (const auto *ConstrIntr =
dyn_cast_if_present<ConstrainedFPIntrinsic>(Call)) {
@@ -3011,8 +3024,11 @@ static Constant *ConstantFoldIntrinsicCall2(Intrinsic::ID IntrinsicID, Type *Ty,
return evaluateCompare(Op1V, Op2V, ConstrIntr);
}
if (mayFoldConstrained(const_cast<ConstrainedFPIntrinsic *>(ConstrIntr),
- St))
- return ConstantFP::get(Ty->getContext(), Res);
+ St)) {
+ auto DenormOut = Call->getOutputDenormMode();
+ DenormalMode::DenormalModeKind Mode = DenormOut;
+ return flushDenormalConstant(Op2->getType(), Res, Mode);
+ }
return nullptr;
}
diff --git a/llvm/lib/IR/Instructions.cpp b/llvm/lib/IR/Instructions.cpp
index 1073c2939a8a3..da766473f5fff 100644
--- a/llvm/lib/IR/Instructions.cpp
+++ b/llvm/lib/IR/Instructions.cpp
@@ -628,13 +628,17 @@ bool CallBase::hasClobberingOperandBundles() const {
RoundingMode CallBase::getRoundingMode() const {
// Try reading rounding mode from FP bundle.
std::optional<RoundingMode> RM;
- if (auto RoundingBundle = getOperandBundle(LLVMContext::OB_fp_control)) {
- Value *V = RoundingBundle->Inputs.front();
- Metadata *MD = cast<MetadataAsValue>(V)->getMetadata();
- RM = convertBundleToRoundingMode(cast<MDString>(MD)->getString());
+ if (auto ControlBundle = getOperandBundle(LLVMContext::OB_fp_control)) {
+ for (auto &U : ControlBundle->Inputs) {
+ Value *V = U.get();
+ if (auto *MDV = dyn_cast<MetadataAsValue>(V)) {
+ Metadata *MD = MDV->getMetadata();
+ if (auto *MDS = dyn_cast<MDString>(MD))
+ if (auto RM = convertBundleToRoundingMode(MDS->getString()))
+ return *RM;
+ }
+ }
}
- if (RM)
- return *RM;
// If this is a constrained intrinsic, get rounding mode from its metadata
// arguments.
@@ -678,6 +682,71 @@ fp::ExceptionBehavior CallBase::getExceptionBehavior() const {
return fp::ebIgnore;
}
+DenormalMode::DenormalModeKind CallBase::getInputDenormMode() const {
+ if (auto InDenormBundle = getOperandBundle(LLVMContext::OB_fp_control)) {
+ auto DenormOperand =
+ getBundleOperandByPrefix(*InDenormBundle, "denorm.in=");
+ if (DenormOperand) {
+ if (auto Mode = parseDenormalKindFromOperandBundle(*DenormOperand))
+ return *Mode;
+ } else {
+ return DenormalMode::IEEE;
+ }
+ }
+
+ if (!getParent())
+ return DenormalMode::IEEE;
+ const Function *F = getFunction();
+ if (!F)
+ return DenormalMode::IEEE;
+
+ Type *Ty = nullptr;
+ for (auto &A : args())
+ if (auto *T = A.get()->getType(); T->isFPOrFPVectorTy()) {
+ Ty = T;
+ break;
+ }
+ assert(Ty && "Some input argument must be of floating-point type");
+
+ Ty = Ty->getScalarType();
+ return F->getDenormalMode(Ty->getFltSemantics()).Input;
+}
+
+DenormalMode::DenormalModeKind CallBase::getOutputDenormMode() const {
+ if (auto InDenormBundle = getOperandBundle(LLVMContext::OB_fp_control)) {
+ auto DenormOperand =
+ getBundleOperandByPrefix(*InDenormBundle, "denorm.out=");
+ if (DenormOperand) {
+ if (auto Mode = parseDenormalKindFromOperandBundle(*DenormOperand))
+ return *Mode;
+ } else {
+ return DenormalMode::IEEE;
+ }
+ }
+
+ if (!getParent())
+ return DenormalMode::IEEE;
+ const Function *F = getFunction();
+ if (!F)
+ return DenormalMode::IEEE;
+
+ Type *Ty = getType();
+ assert(Ty->isFPOrFPVectorTy() && "Unexpected output type");
+
+ Ty = Ty->getScalarType();
+ return F->getDenormalMode(Ty->getFltSemantics()).Output;
+}
+
+DenormalMode CallBase::getDenormMode() const {
+ auto InputMode = getInputDenormMode();
+ auto OutputMode = getOutputDenormMode();
+ if (!InputMode)
+ InputMode = DenormalMode::IEEE;
+ if (!OutputMode)
+ OutputMode = DenormalMode::IEEE;
+ return DenormalMode(OutputMode, InputMode);
+}
+
MemoryEffects CallBase::getFloatingPointMemoryEffects() const {
if (Intrinsic::ID IntrID = getIntrinsicID())
if (const BasicBlock *BB = getParent())
@@ -794,6 +863,69 @@ bool CallBase::hasArgumentWithAdditionalReturnCaptureComponents() const {
return false;
}
+std::optional<StringRef> llvm::getBundleOperandByPrefix(OperandBundleUse Bundle,
+ StringRef Prefix) {
+ for (const auto &Item : Bundle.Inputs) {
+ Metadata *MD = cast<MetadataAsValue>(Item.get())->getMetadata();
+ if (const auto *MDS = dyn_cast<MDString>(MD)) {
+ StringRef Str = MDS->getString();
+ if (Str.consume_front(Prefix))
+ return Str;
+ }
+ }
+ return std::nullopt;
+}
+
+void llvm::addOperandToBundleTag(LLVMContext &Ctx,
+ SmallVectorImpl<OperandBundleDef> &Bundles,
+ StringRef Tag, size_t PrefixSize,
+ StringRef Val) {
+ assert(PrefixSize > 0 && "Unexpected prefix size");
+ assert(PrefixSize < Val.size() && "Invalid prefix size");
+ StringRef Prefix = Val.take_front(PrefixSize);
+
+ // Find a bundle with the specified tag.
+ OperandBundleDef *Bundle = nullptr;
+ for (OperandBundleDef &OB : Bundles) {
+ if (OB.getTag() == Tag) {
+ Bundle = &OB;
+ break;
+ }
+ }
+
+ // If no such bundle are found, create new one with the single value.
+ if (!Bundle) {
+ auto *MStr = MDString::get(Ctx, Val);
+ auto *MD = MetadataAsValue::get(Ctx, MStr);
+ SmallVector<Value *, 1> BundleValues(1, MD);
+ Bundles.emplace_back(Tag.str(), BundleValues);
+ return;
+ }
+
+ // If the bundle is found, search its values for those started with the given
+ // prefix.
+ SmallVector<Value *, 4> Values(Bundle->inputs());
+ for (auto i = Values.begin(), e = Values.end(); i != e; ++i) {
+ if (auto *MV = dyn_cast<MetadataAsValue>(*i)) {
+ if (auto *MD = dyn_cast<MDString>(MV->getMetadata())) {
+ StringRef Str = MD->getString();
+ if (Str == Val)
+ // Already in the values.
+ return;
+ if (Str.starts_with(Prefix)) {
+ Values.erase(i);
+ break;
+ }
+ }
+ }
+ }
+
+ auto *ValMD = MDString::get(Ctx, Val);
+ auto *MD = MetadataAsValue::get(Ctx, ValMD);
+ Values.push_back(MD);
+ Bundles.emplace_back("fp.control", Values);
+}
+
void llvm::addFPRoundingBundle(LLVMContext &Ctx,
SmallVectorImpl<OperandBundleDef> &Bundles,
RoundingMode Rounding) {
@@ -814,6 +946,30 @@ void llvm::addFPExceptionBundle(LLVMContext &Ctx,
Bundles.emplace_back("fp.except", EB);
}
+void llvm::addFPInputDenormBundle(LLVMContext &Ctx,
+ SmallVectorImpl<OperandBundleDef> &Bundles,
+ DenormalMode::DenormalModeKind Mode) {
+ std::optional<StringRef> DenormValue = printDenormalForOperandBundle(Mode);
+ if (!DenormValue)
+ return;
+ std::string Prefix = "denorm.in=";
+ std::string DenormItem = Prefix + DenormValue->str();
+
+ addOperandToBundleTag(Ctx, Bundles, "fp.control", Prefix.size(), DenormItem);
+}
+
+void llvm::addFPOutputDenormBundle(LLVMContext &Ctx,
+ SmallVectorImpl<OperandBundleDef> &Bundles,
+ DenormalMode::DenormalModeKind Mode) {
+ std::optional<StringRef> DenormValue = printDenormalForOperandBundle(Mode);
+ if (!DenormValue)
+ return;
+ std::string Prefix = "denorm.out=";
+ std::string DenormItem = Prefix + DenormValue->str();
+
+ addOperandToBundleTag(Ctx, Bundles, "fp.control", Prefix.size(), DenormItem);
+}
+
//===----------------------------------------------------------------------===//
// CallInst Implementation
//===----------------------------------------------------------------------===//
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 6b7644fef9e71..bb40c4b7b7b83 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -3833,6 +3833,8 @@ void Verifier::visitCallBase(CallBase &Call) {
Check(!FoundFpeControlBundle, "Multiple \"fp.control\" operand bundles",
Call);
bool FoundRoundingMode = false;
+ bool FoundInDenormalMode = false;
+ bool FoundOutDenormalMode = false;
for (auto &U : BU.Inputs) {
Value *V = U.get();
Check(isa<MetadataAsValue>(V),
@@ -3847,6 +3849,18 @@ void Verifier::visitCallBase(CallBase &Call) {
Check(!FoundRoundingMode, "Rounding mode is specified more that once",
Call);
FoundRoundingMode = true;
+ } else if (Item.consume_front("denorm.in=")) {
+ Check(!FoundInDenormalMode,
+ "Input denormal mode is specified more that once", Call);
+ FoundInDenormalMode = true;
+ Check(parseDenormalKindFromOperandBundle(Item),
+ "Invalid input denormal mode", Call);
+ } else if (Item.consume_front("denorm.out=")) {
+ Check(!FoundOutDenormalMode,
+ "Output denormal mode is specified more that once", Call);
+ FoundOutDenormalMode = true;
+ Check(parseDenormalKindFromOperandBundle(Item),
+ "Invalid output denormal mode", Call);
} else {
CheckFailed("Unrecognized value in \"fp.control\" bundle operand",
Call);
diff --git a/llvm/test/Transforms/InstSimplify/constant-fold-fp-denormal-strict.ll b/llvm/test/Transforms/InstSimplify/constant-fold-fp-denormal-strict.ll
new file mode 100644
index 0000000000000..c9886928ce4a4
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/constant-fold-fp-denormal-strict.ll
@@ -0,0 +1,91 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S -passes=instsimplify < %s | FileCheck %s
+
+; 0xB810000000000000 = -0x1.0p-126
+; 0x3800000000000000 = 0x1.0p-127 denormal
+
+define float @test_float_fadd_ieee_strict() #0 {
+; CHECK-LABEL: define float @test_float_fadd_ieee_strict(
+; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT: ret float 0xB800000000000000
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore")
+ ret float %result
+}
+
+define float @test_float_fadd_strict_ieee() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_ieee(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: ret float 0xB800000000000000
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=ieee", metadata !"denorm.out=ieee") ]
+ ret float %result
+}
+
+define float @test_float_fadd_strict_inzero() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_inzero(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: ret float 0xB810000000000000
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=zero", metadata !"denorm.out=ieee") ]
+ ret float %result
+}
+
+define float @test_float_fadd_strict_inpzero() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_inpzero(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: ret float 0xB810000000000000
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=pzero", metadata !"denorm.out=ieee") ]
+ ret float %result
+}
+
+define float @test_float_fadd_strict_indyn() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_indyn(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: [[RESULT:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control"(metadata !"denorm.in=dyn", metadata !"denorm.out=ieee") ]
+; CHECK-NEXT: ret float [[RESULT]]
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=dyn", metadata !"denorm.out=ieee") ]
+ ret float %result
+}
+
+define float @test_float_fadd_strict_ieee_outzero() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_ieee_outzero(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: ret float -0.000000e+00
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=ieee", metadata !"denorm.out=zero") ]
+ ret float %result
+}
+
+define float @test_float_fadd_strict_ieee_outpzero() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_ieee_outpzero(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: ret float 0.000000e+00
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=ieee", metadata !"denorm.out=pzero") ]
+ ret float %result
+}
+
+define float @test_float_fadd_strict_ieee_outdyn() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_ieee_outdyn(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: [[RESULT:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control"(metadata !"denorm.in=ieee", metadata !"denorm.out=dyn") ]
+; CHECK-NEXT: ret float [[RESULT]]
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=ieee", metadata !"denorm.out=dyn") ]
+ ret float %result
+}
+
+define float @test_float_fadd_strict_zero_outdef() #0 {
+; CHECK-LABEL: define float @test_float_fadd_strict_zero_outdef(
+; CHECK-SAME: ) #[[ATTR0]] {
+; CHECK-NEXT: ret float 0xB800000000000000
+;
+ %result = call float @llvm.experimental.constrained.fadd.f32(float 0xB810000000000000, float 0x3800000000000000, metadata !"round.towardzero", metadata !"fpexcept.ignore") [ "fp.control" (metadata !"denorm.in=ieee") ]
+ ret float %result
+}
+
+attributes #0 = { nounwind strictfp "denormal-fp-math"="ieee,ieee" }
+attributes #5 = { nounwind "denormal-fp-math"="ieee,ieee" "denormal-fp-math-f32"="positive-zero,ieee" }
diff --git a/llvm/test/Verifier/fp-intrinsics.ll b/llvm/test/Verifier/fp-intrinsics.ll
index 1e1df1b0da96a..cf67f9b54be92 100644
--- a/llvm/test/Verifier/fp-intrinsics.ll
+++ b/llvm/test/Verifier/fp-intrinsics.ll
@@ -141,5 +141,41 @@ entry:
ret double %ftrunc
}
+; Test fp.control bundle specifies two input demormal modes.
+; CHECK-NEXT: Input denormal mode is specified more that once
+; CHECK-NEXT: %ftrunc = call double @llvm.trunc.f64(double %a) #{{[0-9]+}} [ "fp.control"(metadata !"denorm.in=ieee", metadata !"denorm.in=ieee") ]
+define double @f16(double %a) #0 {
+entry:
+ %ftrunc = call double @llvm.trunc.f64(double %a) #0 [ "fp.control"(metadata !"denorm.in=ieee", metadata !"denorm.in=ieee") ]
+ ret double %ftrunc
+}
+
+; Test fp.control bundle specifies two output demormal modes.
+; CHECK-NEXT: Output denormal mode is specified more that once
+; CHECK-NEXT: %ftrunc = call double @llvm.trunc.f64(double %a) #{{[0-9]+}} [ "fp.control"(metadata !"denorm.out=ieee", metadata !"denorm.out=ieee") ]
+define double @f17(double %a) #0 {
+entry:
+ %ftrunc = call double @llvm.trunc.f64(double %a) #0 [ "fp.control"(metadata !"denorm.out=ieee", metadata !"denorm.out=ieee") ]
+ ret double %ftrunc
+}
+
+; Test fp.control bundle specifies invalid input demormal modes.
+; CHECK-NEXT: Invalid input denormal mode
+; CHECK-NEXT: %ftrunc = call double @llvm.trunc.f64(double %a) #{{[0-9]+}} [ "fp.control"(metadata !"denorm.in=qqq") ]
+define double @f18(double %a) #0 {
+entry:
+ %ftrunc = call double @llvm.trunc.f64(double %a) #0 [ "fp.control"(metadata !"denorm.in=qqq") ]
+ ret double %ftrunc
+}
+
+; Test fp.control bundle specifies invalid output demormal modes.
+; CHECK-NEXT: Invalid output denormal mode
+; CHECK-NEXT: %ftrunc = call double @llvm.trunc.f64(double %a) #{{[0-9]+}} [ "fp.control"(metadata !"denorm.out=qqq") ]
+define double @f19(double %a) #0 {
+entry:
+ %ftrunc = call double @llvm.trunc.f64(double %a) #0 [ "fp.control"(metadata !"denorm.out=qqq") ]
+ ret double %ftrunc
+}
+
attributes #0 = { strictfp }
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