[clang] 85d049a - Implement support for option 'fexcess-precision'.
Zahira Ammarguellat via cfe-commits
cfe-commits at lists.llvm.org
Thu Jan 5 06:35:35 PST 2023
Author: Zahira Ammarguellat
Date: 2023-01-05T09:35:28-05:00
New Revision: 85d049a089d4a6a4a67145429ea5d8e155651138
URL: https://github.com/llvm/llvm-project/commit/85d049a089d4a6a4a67145429ea5d8e155651138
DIFF: https://github.com/llvm/llvm-project/commit/85d049a089d4a6a4a67145429ea5d8e155651138.diff
LOG: Implement support for option 'fexcess-precision'.
Differential revision: https://reviews.llvm.org/D136176
Added:
clang/test/CodeGen/X86/fexcess-precision.c
clang/test/Driver/fexcess-precision.c
Modified:
clang/docs/UsersManual.rst
clang/include/clang/AST/Type.h
clang/include/clang/Basic/FPOptions.def
clang/include/clang/Basic/LangOptions.def
clang/include/clang/Basic/LangOptions.h
clang/include/clang/Basic/TargetInfo.h
clang/include/clang/Driver/Options.td
clang/lib/AST/Type.cpp
clang/lib/Basic/Targets/X86.h
clang/lib/CodeGen/CGExprComplex.cpp
clang/lib/CodeGen/CGExprScalar.cpp
clang/lib/Driver/ToolChains/Clang.cpp
clang/test/Driver/clang_f_opts.c
Removed:
################################################################################
diff --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst
index d4e5b3565ee0..7dd8ecb5fcc4 100644
--- a/clang/docs/UsersManual.rst
+++ b/clang/docs/UsersManual.rst
@@ -1746,6 +1746,47 @@ floating point semantic models: precise (the default), strict, and fast.
has no effect because the optimizer is prohibited from making unsafe
transformations.
+.. option:: -fexcess-precision:
+
+ The C and C++ standards allow floating-point expressions to be computed as if
+ intermediate results had more precision (and/or a wider range) than the type
+ of the expression strictly allows. This is called excess precision
+ arithmetic.
+ Excess precision arithmetic can improve the accuracy of results (although not
+ always), and it can make computation significantly faster if the target lacks
+ direct hardware support for arithmetic in a particular type. However, it can
+ also undermine strict floating-point reproducibility.
+
+ Under the standards, assignments and explicit casts force the operand to be
+ converted to its formal type, discarding any excess precision. Because data
+ can only flow between statements via an assignment, this means that the use
+ of excess precision arithmetic is a reliable local property of a single
+ statement, and results do not change based on optimization. However, when
+ excess precision arithmetic is in use, Clang does not guarantee strict
+ reproducibility, and future compiler releases may recognize more
+ opportunities to use excess precision arithmetic, e.g. with floating-point
+ builtins.
+
+ Clang does not use excess precision arithmetic for most types or on most
+ targets. For example, even on pre-SSE X86 targets where ``float`` and
+ ``double`` computations must be performed in the 80-bit X87 format, Clang
+ rounds all intermediate results correctly for their type. Clang currently
+ uses excess precision arithmetic by default only for the following types and
+ targets:
+
+ * ``_Float16`` on X86 targets without ``AVX512-FP16``.
+
+ The ``-fexcess-precision=<value>`` option can be used to control the use of
+ excess precision arithmetic. Valid values are:
+
+ * ``standard`` - The default. Allow the use of excess precision arithmetic
+ under the constraints of the C and C++ standards. Has no effect except on
+ the types and targets listed above.
+ * ``fast`` - Accepted for GCC compatibility, but currently treated as an
+ alias for ``standard``.
+ * ``16`` - Forces ``_Float16`` operations to be emitted without using excess
+ precision arithmetic.
+
.. _crtfastmath.o:
A note about ``crtfastmath.o``
diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
index 8f7a4836381a..af6dbcf3988a 100644
--- a/clang/include/clang/AST/Type.h
+++ b/clang/include/clang/AST/Type.h
@@ -763,6 +763,8 @@ class QualType {
unsigned getLocalFastQualifiers() const { return Value.getInt(); }
void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); }
+ bool UseExcessPrecision(const ASTContext &Ctx);
+
/// Retrieves a pointer to the underlying (unqualified) type.
///
/// This function requires that the type not be NULL. If the type might be
diff --git a/clang/include/clang/Basic/FPOptions.def b/clang/include/clang/Basic/FPOptions.def
index 1dfbbb549c87..0c687e3c3fa0 100644
--- a/clang/include/clang/Basic/FPOptions.def
+++ b/clang/include/clang/Basic/FPOptions.def
@@ -25,4 +25,5 @@ OPTION(NoSignedZero, bool, 1, NoHonorInfs)
OPTION(AllowReciprocal, bool, 1, NoSignedZero)
OPTION(AllowApproxFunc, bool, 1, AllowReciprocal)
OPTION(FPEvalMethod, LangOptions::FPEvalMethodKind, 2, AllowApproxFunc)
+OPTION(Float16ExcessPrecision, LangOptions::ExcessPrecisionKind, 2, FPEvalMethod)
#undef OPTION
diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
index 4ccf84b88385..d1cbe4306439 100644
--- a/clang/include/clang/Basic/LangOptions.def
+++ b/clang/include/clang/Basic/LangOptions.def
@@ -317,6 +317,7 @@ COMPATIBLE_LANGOPT(ExpStrictFP, 1, false, "Enable experimental strict floating p
BENIGN_LANGOPT(RoundingMath, 1, false, "Do not assume default floating-point rounding behavior")
BENIGN_ENUM_LANGOPT(FPExceptionMode, FPExceptionModeKind, 2, FPE_Default, "FP Exception Behavior Mode type")
BENIGN_ENUM_LANGOPT(FPEvalMethod, FPEvalMethodKind, 2, FEM_UnsetOnCommandLine, "FP type used for floating point arithmetic")
+ENUM_LANGOPT(Float16ExcessPrecision, ExcessPrecisionKind, 2, FPP_Standard, "Intermediate truncation behavior for floating point arithmetic")
LANGOPT(NoBitFieldTypeAlign , 1, 0, "bit-field type alignment")
LANGOPT(HexagonQdsp6Compat , 1, 0, "hexagon-qdsp6 backward compatibility")
LANGOPT(ObjCAutoRefCount , 1, 0, "Objective-C automated reference counting")
diff --git a/clang/include/clang/Basic/LangOptions.h b/clang/include/clang/Basic/LangOptions.h
index 70b123434f6f..41b0426a2d4b 100644
--- a/clang/include/clang/Basic/LangOptions.h
+++ b/clang/include/clang/Basic/LangOptions.h
@@ -295,6 +295,8 @@ class LangOptions : public LangOptionsBase {
FEM_UnsetOnCommandLine = 3
};
+ enum ExcessPrecisionKind { FPP_Standard, FPP_Fast, FPP_None };
+
/// Possible exception handling behavior.
enum class ExceptionHandlingKind { None, SjLj, WinEH, DwarfCFI, Wasm };
diff --git a/clang/include/clang/Basic/TargetInfo.h b/clang/include/clang/Basic/TargetInfo.h
index 9e310f6473a6..a5aea33d8475 100644
--- a/clang/include/clang/Basic/TargetInfo.h
+++ b/clang/include/clang/Basic/TargetInfo.h
@@ -933,8 +933,6 @@ class TargetInfo : public virtual TransferrableTargetInfo,
return true;
}
- virtual bool shouldEmitFloat16WithExcessPrecision() const { return false; }
-
/// Specify if mangling based on address space map should be used or
/// not for language specific address spaces
bool useAddressSpaceMapMangling() const {
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index cf204ae6b441..dd299fa8e883 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -1576,8 +1576,22 @@ def exception_model_EQ : Joined<["-"], "exception-model=">,
def fignore_exceptions : Flag<["-"], "fignore-exceptions">, Group<f_Group>, Flags<[CC1Option]>,
HelpText<"Enable support for ignoring exception handling constructs">,
MarshallingInfoFlag<LangOpts<"IgnoreExceptions">>;
-def fexcess_precision_EQ : Joined<["-"], "fexcess-precision=">,
- Group<clang_ignored_gcc_optimization_f_Group>;
+def fexcess_precision_EQ : Joined<["-"], "fexcess-precision=">, Group<f_Group>,
+ HelpText<"Allows control over excess precision on targets where native "
+ "support for the precision types is not available. By default, excess "
+ "precision is used to calculate intermediate results following the "
+ "rules specified in ISO C99.">,
+ Values<"standard,fast,none">, NormalizedValuesScope<"LangOptions">,
+ NormalizedValues<["FPP_Standard", "FPP_Fast", "FPP_None"]>;
+def ffloat16_excess_precision_EQ : Joined<["-"], "ffloat16-excess-precision=">,
+ Group<f_Group>, Flags<[CC1Option, NoDriverOption]>,
+ HelpText<"Allows control over excess precision on targets where native "
+ "support for Float16 precision types is not available. By default, excess "
+ "precision is used to calculate intermediate results following the "
+ "rules specified in ISO C99.">,
+ Values<"standard,fast,none">, NormalizedValuesScope<"LangOptions">,
+ NormalizedValues<["FPP_Standard", "FPP_Fast", "FPP_None"]>,
+ MarshallingInfoEnum<LangOpts<"Float16ExcessPrecision">, "FPP_Standard">;
def : Flag<["-"], "fexpensive-optimizations">, Group<clang_ignored_gcc_optimization_f_Group>;
def : Flag<["-"], "fno-expensive-optimizations">, Group<clang_ignored_gcc_optimization_f_Group>;
def fextdirs_EQ : Joined<["-"], "fextdirs=">, Group<f_Group>;
diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
index 54bfb023237b..eb249ae7c658 100644
--- a/clang/lib/AST/Type.cpp
+++ b/clang/lib/AST/Type.cpp
@@ -1483,6 +1483,25 @@ struct StripObjCKindOfTypeVisitor
} // namespace
+bool QualType::UseExcessPrecision(const ASTContext &Ctx) {
+ const BuiltinType *BT = getTypePtr()->getAs<BuiltinType>();
+ if (BT) {
+ switch (BT->getKind()) {
+ case BuiltinType::Kind::Float16: {
+ const TargetInfo &TI = Ctx.getTargetInfo();
+ if (TI.hasFloat16Type() && !TI.hasLegalHalfType() &&
+ Ctx.getLangOpts().getFloat16ExcessPrecision() !=
+ Ctx.getLangOpts().ExcessPrecisionKind::FPP_None)
+ return true;
+ return false;
+ }
+ default:
+ return false;
+ }
+ }
+ return false;
+}
+
/// Substitute the given type arguments for Objective-C type
/// parameters within the given type, recursively.
QualType QualType::substObjCTypeArgs(ASTContext &ctx,
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
index 0f0ca5d9a5f9..3a02889f9f6d 100644
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -302,10 +302,6 @@ class LLVM_LIBRARY_VISIBILITY X86TargetInfo : public TargetInfo {
return false;
}
- bool shouldEmitFloat16WithExcessPrecision() const override {
- return HasFloat16 && !hasLegalHalfType();
- }
-
void getTargetDefines(const LangOptions &Opts,
MacroBuilder &Builder) const override;
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index a31685ddf38a..e65e925a11d4 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -275,18 +275,13 @@ class ComplexExprEmitter
const BinOpInfo &Op);
QualType getPromotionType(QualType Ty) {
- if (CGF.getTarget().shouldEmitFloat16WithExcessPrecision()) {
- if (Ty->isRealFloatingType()) {
- if (Ty->isFloat16Type())
- return CGF.getContext().FloatTy;
- } else {
- assert(Ty->isAnyComplexType() &&
- "Expecting to promote a complex type!");
- QualType ElementType = Ty->castAs<ComplexType>()->getElementType();
- if (ElementType->isFloat16Type())
- return CGF.getContext().getComplexType(CGF.getContext().FloatTy);
- }
+ if (auto *CT = Ty->getAs<ComplexType>()) {
+ QualType ElementType = CT->getElementType();
+ if (ElementType.UseExcessPrecision(CGF.getContext()))
+ return CGF.getContext().getComplexType(CGF.getContext().FloatTy);
}
+ if (Ty.UseExcessPrecision(CGF.getContext()))
+ return CGF.getContext().FloatTy;
return QualType();
}
diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index 6e67d3da6f2b..d8de8af0be7c 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -814,15 +814,13 @@ class ScalarExprEmitter
Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
QualType getPromotionType(QualType Ty) {
- if (CGF.getTarget().shouldEmitFloat16WithExcessPrecision()) {
- if (Ty->isAnyComplexType()) {
- QualType ElementType = Ty->castAs<ComplexType>()->getElementType();
- if (ElementType->isFloat16Type())
- return CGF.getContext().getComplexType(CGF.getContext().FloatTy);
- }
- if (Ty->isFloat16Type())
- return CGF.getContext().FloatTy;
+ if (auto *CT = Ty->getAs<ComplexType>()) {
+ QualType ElementType = CT->getElementType();
+ if (ElementType.UseExcessPrecision(CGF.getContext()))
+ return CGF.getContext().getComplexType(CGF.getContext().FloatTy);
}
+ if (Ty.UseExcessPrecision(CGF.getContext()))
+ return CGF.getContext().FloatTy;
return QualType();
}
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 3635748ab9aa..f16c79988799 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2705,6 +2705,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
!JA.isOffloading(Action::OFK_HIP))
FPContract = "on";
bool StrictFPModel = false;
+ StringRef Float16ExcessPrecision = "";
if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {
CmdArgs.push_back("-mlimit-float-precision");
@@ -2901,6 +2902,27 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
break;
}
+ case options::OPT_fexcess_precision_EQ: {
+ StringRef Val = A->getValue();
+ const llvm::Triple::ArchType Arch = TC.getArch();
+ if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64) {
+ if (Val.equals("standard") || Val.equals("fast"))
+ Float16ExcessPrecision = Val;
+ // To make it GCC compatible, allow the value of "16" which
+ // means disable excess precision, the same meaning than clang's
+ // equivalent value "none".
+ else if (Val.equals("16"))
+ Float16ExcessPrecision = "none";
+ else
+ D.Diag(diag::err_drv_unsupported_option_argument)
+ << A->getSpelling() << Val;
+ } else {
+ if (!(Val.equals("standard") || Val.equals("fast")))
+ D.Diag(diag::err_drv_unsupported_option_argument)
+ << A->getSpelling() << Val;
+ }
+ break;
+ }
case options::OPT_ffinite_math_only:
HonorINFs = false;
HonorNaNs = false;
@@ -3071,6 +3093,10 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
if (!FPEvalMethod.empty())
CmdArgs.push_back(Args.MakeArgString("-ffp-eval-method=" + FPEvalMethod));
+ if (!Float16ExcessPrecision.empty())
+ CmdArgs.push_back(Args.MakeArgString("-ffloat16-excess-precision=" +
+ Float16ExcessPrecision));
+
ParseMRecip(D, Args, CmdArgs);
// -ffast-math enables the __FAST_MATH__ preprocessor macro, but check for the
diff --git a/clang/test/CodeGen/X86/fexcess-precision.c b/clang/test/CodeGen/X86/fexcess-precision.c
new file mode 100644
index 000000000000..325706830f89
--- /dev/null
+++ b/clang/test/CodeGen/X86/fexcess-precision.c
@@ -0,0 +1,387 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast -target-feature +avx512fp16 \
+// RUN: -emit-llvm -o - %s | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard -target-feature +avx512fp16 \
+// RUN: -emit-llvm -o - %s | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast \
+// RUN: -emit-llvm -ffp-eval-method=source -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=source -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard \
+// RUN: -emit-llvm -ffp-eval-method=source -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=source -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -emit-llvm -ffp-eval-method=source -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=source -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast \
+// RUN: -emit-llvm -ffp-eval-method=double -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=double -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard \
+// RUN: -emit-llvm -ffp-eval-method=double -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=double -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -emit-llvm -ffp-eval-method=double -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=double -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast \
+// RUN: -emit-llvm -ffp-eval-method=extended -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-FP80 %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=fast -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=extended -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-FP80 %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard \
+// RUN: -emit-llvm -ffp-eval-method=extended -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-FP80 %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=standard -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=extended -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-FP80 %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -emit-llvm -ffp-eval-method=extended -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-FP80 %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -emit-llvm -ffp-eval-method=extended -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-EXT-FP80 %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -ffp-contract=on -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -ffp-contract=on -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -fmath-errno -ffp-contract=on -fno-rounding-math \
+// RUN: -ffp-eval-method=source -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -fmath-errno -ffp-contract=on -fno-rounding-math \
+// RUN: -ffp-eval-method=source -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -fmath-errno -ffp-contract=on -fno-rounding-math \
+// RUN: -ffp-eval-method=double -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -fmath-errno -ffp-contract=on -fno-rounding-math \
+// RUN: -ffp-eval-method=double -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT-DBL %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -fmath-errno -ffp-contract=on -fno-rounding-math \
+// RUN: -ffp-eval-method=extended -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -fmath-errno -ffp-contract=on -fno-rounding-math \
+// RUN: -ffp-eval-method=extended -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-CONTRACT-EXT %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none \
+// RUN: -fapprox-func -fmath-errno -fno-signed-zeros -mreassociate \
+// RUN: -freciprocal-math -ffp-contract=on -fno-rounding-math \
+// RUN: -funsafe-math-optimizations -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-UNSAFE %s
+
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown \
+// RUN: -ffloat16-excess-precision=none -target-feature +avx512fp16 \
+// RUN: -fapprox-func -fmath-errno -fno-signed-zeros -mreassociate \
+// RUN: -freciprocal-math -ffp-contract=on -fno-rounding-math \
+// RUN: -funsafe-math-optimizations -emit-llvm -o - %s \
+// RUN: | FileCheck -check-prefixes=CHECK-UNSAFE %s
+
+// CHECK-EXT-LABEL: @f(
+// CHECK-EXT-NEXT: entry:
+// CHECK-EXT-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-EXT-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-EXT-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-EXT-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-EXT-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-EXT-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-EXT-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-EXT-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-EXT-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-EXT-NEXT: [[EXT:%.*]] = fpext half [[TMP0]] to float
+// CHECK-EXT-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-EXT-NEXT: [[EXT1:%.*]] = fpext half [[TMP1]] to float
+// CHECK-EXT-NEXT: [[MUL:%.*]] = fmul float [[EXT]], [[EXT1]]
+// CHECK-EXT-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-EXT-NEXT: [[EXT2:%.*]] = fpext half [[TMP2]] to float
+// CHECK-EXT-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-EXT-NEXT: [[EXT3:%.*]] = fpext half [[TMP3]] to float
+// CHECK-EXT-NEXT: [[MUL4:%.*]] = fmul float [[EXT2]], [[EXT3]]
+// CHECK-EXT-NEXT: [[ADD:%.*]] = fadd float [[MUL]], [[MUL4]]
+// CHECK-EXT-NEXT: [[UNPROMOTION:%.*]] = fptrunc float [[ADD]] to half
+// CHECK-EXT-NEXT: ret half [[UNPROMOTION]]
+//
+// CHECK-NO-EXT-LABEL: @f(
+// CHECK-NO-EXT-NEXT: entry:
+// CHECK-NO-EXT-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-NO-EXT-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-NO-EXT-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-NO-EXT-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-NO-EXT-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-NO-EXT-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-NO-EXT-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-NO-EXT-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-NO-EXT-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-NO-EXT-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-NO-EXT-NEXT: [[MUL:%.*]] = fmul half [[TMP0]], [[TMP1]]
+// CHECK-NO-EXT-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-NO-EXT-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-NO-EXT-NEXT: [[MUL1:%.*]] = fmul half [[TMP2]], [[TMP3]]
+// CHECK-NO-EXT-NEXT: [[ADD:%.*]] = fadd half [[MUL]], [[MUL1]]
+// CHECK-NO-EXT-NEXT: ret half [[ADD]]
+//
+// CHECK-EXT-DBL-LABEL: @f(
+// CHECK-EXT-DBL-NEXT: entry:
+// CHECK-EXT-DBL-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-EXT-DBL-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-EXT-DBL-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-EXT-DBL-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-EXT-DBL-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-EXT-DBL-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-EXT-DBL-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-EXT-DBL-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-EXT-DBL-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-EXT-DBL-NEXT: [[CONV:%.*]] = fpext half [[TMP0]] to double
+// CHECK-EXT-DBL-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-EXT-DBL-NEXT: [[CONV1:%.*]] = fpext half [[TMP1]] to double
+// CHECK-EXT-DBL-NEXT: [[MUL:%.*]] = fmul double [[CONV]], [[CONV1]]
+// CHECK-EXT-DBL-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-EXT-DBL-NEXT: [[CONV2:%.*]] = fpext half [[TMP2]] to double
+// CHECK-EXT-DBL-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-EXT-DBL-NEXT: [[CONV3:%.*]] = fpext half [[TMP3]] to double
+// CHECK-EXT-DBL-NEXT: [[MUL4:%.*]] = fmul double [[CONV2]], [[CONV3]]
+// CHECK-EXT-DBL-NEXT: [[ADD:%.*]] = fadd double [[MUL]], [[MUL4]]
+// CHECK-EXT-DBL-NEXT: [[CONV5:%.*]] = fptrunc double [[ADD]] to half
+// CHECK-EXT-DBL-NEXT: ret half [[CONV5]]
+//
+// CHECK-EXT-FP80-LABEL: @f(
+// CHECK-EXT-FP80-NEXT: entry:
+// CHECK-EXT-FP80-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-EXT-FP80-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-EXT-FP80-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-EXT-FP80-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-EXT-FP80-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-EXT-FP80-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-EXT-FP80-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-EXT-FP80-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-EXT-FP80-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-EXT-FP80-NEXT: [[CONV:%.*]] = fpext half [[TMP0]] to x86_fp80
+// CHECK-EXT-FP80-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-EXT-FP80-NEXT: [[CONV1:%.*]] = fpext half [[TMP1]] to x86_fp80
+// CHECK-EXT-FP80-NEXT: [[MUL:%.*]] = fmul x86_fp80 [[CONV]], [[CONV1]]
+// CHECK-EXT-FP80-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-EXT-FP80-NEXT: [[CONV2:%.*]] = fpext half [[TMP2]] to x86_fp80
+// CHECK-EXT-FP80-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-EXT-FP80-NEXT: [[CONV3:%.*]] = fpext half [[TMP3]] to x86_fp80
+// CHECK-EXT-FP80-NEXT: [[MUL4:%.*]] = fmul x86_fp80 [[CONV2]], [[CONV3]]
+// CHECK-EXT-FP80-NEXT: [[ADD:%.*]] = fadd x86_fp80 [[MUL]], [[MUL4]]
+// CHECK-EXT-FP80-NEXT: [[CONV5:%.*]] = fptrunc x86_fp80 [[ADD]] to half
+// CHECK-EXT-FP80-NEXT: ret half [[CONV5]]
+//
+// CHECK-CONTRACT-LABEL: @f(
+// CHECK-CONTRACT-NEXT: entry:
+// CHECK-CONTRACT-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-CONTRACT-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-CONTRACT-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-CONTRACT-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-CONTRACT-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-CONTRACT-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-CONTRACT-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-CONTRACT-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-CONTRACT-NEXT: [[MUL1:%.*]] = fmul half [[TMP2]], [[TMP3]]
+// CHECK-CONTRACT-NEXT: [[TMP4:%.*]] = call half @llvm.fmuladd.f16(half [[TMP0]], half [[TMP1]], half [[MUL1]])
+// CHECK-CONTRACT-NEXT: ret half [[TMP4]]
+//
+// CHECK-CONTRACT-DBL-LABEL: @f(
+// CHECK-CONTRACT-DBL-NEXT: entry:
+// CHECK-CONTRACT-DBL-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-DBL-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-DBL-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-DBL-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-DBL-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: [[CONV:%.*]] = fpext half [[TMP0]] to double
+// CHECK-CONTRACT-DBL-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: [[CONV1:%.*]] = fpext half [[TMP1]] to double
+// CHECK-CONTRACT-DBL-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: [[CONV2:%.*]] = fpext half [[TMP2]] to double
+// CHECK-CONTRACT-DBL-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-CONTRACT-DBL-NEXT: [[CONV3:%.*]] = fpext half [[TMP3]] to double
+// CHECK-CONTRACT-DBL-NEXT: [[MUL4:%.*]] = fmul double [[CONV2]], [[CONV3]]
+// CHECK-CONTRACT-DBL-NEXT: [[TMP4:%.*]] = call double @llvm.fmuladd.f64(double [[CONV]], double [[CONV1]], double [[MUL4]])
+// CHECK-CONTRACT-DBL-NEXT: [[CONV5:%.*]] = fptrunc double [[TMP4]] to half
+// CHECK-CONTRACT-DBL-NEXT: ret half [[CONV5]]
+//
+// CHECK-CONTRACT-EXT-LABEL: @f(
+// CHECK-CONTRACT-EXT-NEXT: entry:
+// CHECK-CONTRACT-EXT-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-EXT-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-EXT-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-EXT-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-CONTRACT-EXT-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: [[CONV:%.*]] = fpext half [[TMP0]] to x86_fp80
+// CHECK-CONTRACT-EXT-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: [[CONV1:%.*]] = fpext half [[TMP1]] to x86_fp80
+// CHECK-CONTRACT-EXT-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: [[CONV2:%.*]] = fpext half [[TMP2]] to x86_fp80
+// CHECK-CONTRACT-EXT-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-CONTRACT-EXT-NEXT: [[CONV3:%.*]] = fpext half [[TMP3]] to x86_fp80
+// CHECK-CONTRACT-EXT-NEXT: [[MUL4:%.*]] = fmul x86_fp80 [[CONV2]], [[CONV3]]
+// CHECK-CONTRACT-EXT-NEXT: [[TMP4:%.*]] = call x86_fp80 @llvm.fmuladd.f80(x86_fp80 [[CONV]], x86_fp80 [[CONV1]], x86_fp80 [[MUL4]])
+// CHECK-CONTRACT-EXT-NEXT: [[CONV5:%.*]] = fptrunc x86_fp80 [[TMP4]] to half
+// CHECK-CONTRACT-EXT-NEXT: ret half [[CONV5]]
+//
+// CHECK-UNSAFE-LABEL: @f(
+// CHECK-UNSAFE-NEXT: entry:
+// CHECK-UNSAFE-NEXT: [[A_ADDR:%.*]] = alloca half
+// CHECK-UNSAFE-NEXT: [[B_ADDR:%.*]] = alloca half
+// CHECK-UNSAFE-NEXT: [[C_ADDR:%.*]] = alloca half
+// CHECK-UNSAFE-NEXT: [[D_ADDR:%.*]] = alloca half
+// CHECK-UNSAFE-NEXT: store half [[A:%.*]], ptr [[A_ADDR]]
+// CHECK-UNSAFE-NEXT: store half [[B:%.*]], ptr [[B_ADDR]]
+// CHECK-UNSAFE-NEXT: store half [[C:%.*]], ptr [[C_ADDR]]
+// CHECK-UNSAFE-NEXT: store half [[D:%.*]], ptr [[D_ADDR]]
+// CHECK-UNSAFE-NEXT: [[TMP0:%.*]] = load half, ptr [[A_ADDR]]
+// CHECK-UNSAFE-NEXT: [[TMP1:%.*]] = load half, ptr [[B_ADDR]]
+// CHECK-UNSAFE-NEXT: [[TMP2:%.*]] = load half, ptr [[C_ADDR]]
+// CHECK-UNSAFE-NEXT: [[TMP3:%.*]] = load half, ptr [[D_ADDR]]
+// CHECK-UNSAFE-NEXT: [[MUL1:%.*]] = fmul reassoc nsz arcp afn half [[TMP2]], [[TMP3]]
+// CHECK-UNSAFE-NEXT: [[TMP4:%.*]] = call reassoc nsz arcp afn half @llvm.fmuladd.f16(half [[TMP0]], half [[TMP1]], half [[MUL1]])
+// CHECK-UNSAFE-NEXT: ret half [[TMP4]]
+//
+_Float16 f(_Float16 a, _Float16 b, _Float16 c, _Float16 d) {
+ return a * b + c * d;
+}
+
+// CHECK-EXT-LABEL: @getFEM(
+// CHECK-EXT-NEXT: entry:
+// CHECK-EXT-NEXT: ret i32 0
+//
+// CHECK-NO-EXT-LABEL: @getFEM(
+// CHECK-NO-EXT-NEXT: entry:
+// CHECK-NO-EXT-NEXT: ret i32 0
+//
+// CHECK-EXT-DBL-LABEL: @getFEM(
+// CHECK-EXT-DBL-NEXT: entry:
+// CHECK-EXT-DBL-NEXT: ret i32 1
+//
+// CHECK-EXT-FP80-LABEL: @getFEM(
+// CHECK-EXT-FP80-NEXT: entry:
+// CHECK-EXT-FP80-NEXT: ret i32 2
+//
+// CHECK-CONTRACT-LABEL: @getFEM(
+// CHECK-CONTRACT-NEXT: entry:
+// CHECK-CONTRACT-NEXT: ret i32 0
+//
+// CHECK-CONTRACT-DBL-LABEL: @getFEM(
+// CHECK-CONTRACT-DBL-NEXT: entry:
+// CHECK-CONTRACT-DBL-NEXT: ret i32 1
+//
+// CHECK-CONTRACT-EXT-LABEL: @getFEM(
+// CHECK-CONTRACT-EXT-NEXT: entry:
+// CHECK-CONTRACT-EXT-NEXT: ret i32 2
+//
+// CHECK-UNSAFE-LABEL: @getFEM(
+// CHECK-UNSAFE-NEXT: entry:
+// CHECK-UNSAFE-NEXT: ret i32 -1
+//
+int getFEM() {
+ return __FLT_EVAL_METHOD__;
+}
diff --git a/clang/test/Driver/clang_f_opts.c b/clang/test/Driver/clang_f_opts.c
index 0ac67d60f7d3..446bb07ee6cb 100644
--- a/clang/test/Driver/clang_f_opts.c
+++ b/clang/test/Driver/clang_f_opts.c
@@ -398,7 +398,7 @@
// CHECK-WARNING-DAG: optimization flag '-falign-loops' is not supported
// CHECK-WARNING-DAG: optimization flag '-falign-jumps' is not supported
// CHECK-WARNING-DAG: optimization flag '-falign-jumps=100' is not supported
-// CHECK-WARNING-DAG: optimization flag '-fexcess-precision=100' is not supported
+// CHECK-WARNING-DAG: unsupported argument '100' to option '-fexcess-precision='
// CHECK-WARNING-DAG: optimization flag '-fbranch-count-reg' is not supported
// CHECK-WARNING-DAG: optimization flag '-fcaller-saves' is not supported
// CHECK-WARNING-DAG: optimization flag '-fno-default-inline' is not supported
diff --git a/clang/test/Driver/fexcess-precision.c b/clang/test/Driver/fexcess-precision.c
new file mode 100644
index 000000000000..05f1ddbdb70e
--- /dev/null
+++ b/clang/test/Driver/fexcess-precision.c
@@ -0,0 +1,34 @@
+// RUN: %clang -### -target i386 -fexcess-precision=fast -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-FAST %s
+// RUN: %clang -### -target i386 -fexcess-precision=standard -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-STD %s
+// RUN: %clang -### -target i386 -fexcess-precision=16 -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NONE %s
+// RUN: %clang -### -target i386 -fexcess-precision=none -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-ERR-NONE %s
+
+// RUN: %clang -### -target x86_64 -fexcess-precision=fast -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-FAST %s
+// RUN: %clang -### -target x86_64 -fexcess-precision=standard -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-STD %s
+// RUN: %clang -### -target x86_64 -fexcess-precision=16 -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NONE %s
+// RUN: %clang -### -target x86_64 -fexcess-precision=none -c %s 2>&1 \
+// RUN: | FileCheck --check-prefixes=CHECK-ERR-NONE %s
+
+// RUN: %clang -### -target aarch64 -fexcess-precision=fast -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK %s
+// RUN: %clang -### -target aarch64 -fexcess-precision=standard -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK %s
+// RUN: %clang -### -target aarch64 -fexcess-precision=16 -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-ERR-16 %s
+// RUN: %clang -### -target aarch64 -fexcess-precision=none -c %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-ERR-NONE %s
+
+// CHECK-FAST: "-ffloat16-excess-precision=fast"
+// CHECK-STD: "-ffloat16-excess-precision=standard"
+// CHECK-NONE: "-ffloat16-excess-precision=none"
+// CHECK-ERR-NONE: unsupported argument 'none' to option '-fexcess-precision='
+// CHECK: "-cc1"
+// CHECK-NOT: "-ffloat16-excess-precision=fast"
+// CHECK-ERR-16: unsupported argument '16' to option '-fexcess-precision='
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