[clang] c4dc3c0 - [flang] Add -f[no-]associative-math and -mreassociate
Tom Eccles via cfe-commits
cfe-commits at lists.llvm.org
Fri Nov 4 10:25:14 PDT 2022
Author: Tom Eccles
Date: 2022-11-04T17:22:35Z
New Revision: c4dc3c029416a25103d631e8dc5422f65c076376
URL: https://github.com/llvm/llvm-project/commit/c4dc3c029416a25103d631e8dc5422f65c076376
DIFF: https://github.com/llvm/llvm-project/commit/c4dc3c029416a25103d631e8dc5422f65c076376.diff
LOG: [flang] Add -f[no-]associative-math and -mreassociate
Only add the option processing and store the result. No attributes are
added to FIR yet.
Clang only forwards -mreassociate
if (AssociativeMath && !SignedZeros && !TrappingMath)
Flang doesn't have -f[no-]trapping-math, so this part of the condition
has been omitted. !TrappingMath is the default.
Differential Revision: https://reviews.llvm.org/D137329
Added:
Modified:
clang/include/clang/Driver/Options.td
clang/lib/Driver/ToolChains/Flang.cpp
flang/include/flang/Frontend/LangOptions.def
flang/lib/Frontend/CompilerInvocation.cpp
flang/test/Driver/driver-help.f90
flang/test/Driver/flang_fp_opts.f90
flang/test/Driver/frontend-forwarding.f90
Removed:
################################################################################
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 99500918d8bf7..77c84396fa995 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -5444,9 +5444,6 @@ def mframe_pointer_EQ : Joined<["-"], "mframe-pointer=">,
HelpText<"Specify which frame pointers to retain.">, Values<"all,non-leaf,none">,
NormalizedValuesScope<"CodeGenOptions::FramePointerKind">, NormalizedValues<["All", "NonLeaf", "None"]>,
MarshallingInfoEnum<CodeGenOpts<"FramePointer">, "None">;
-def mreassociate : Flag<["-"], "mreassociate">,
- HelpText<"Allow reassociation transformations for floating-point instructions">,
- MarshallingInfoFlag<LangOpts<"AllowFPReassoc">>, ImpliedByAnyOf<[funsafe_math_optimizations.KeyPath]>;
def mabi_EQ_ieeelongdouble : Flag<["-"], "mabi=ieeelongdouble">,
HelpText<"Use IEEE 754 quadruple-precision for long double">,
MarshallingInfoFlag<LangOpts<"PPCIEEELongDouble">>;
@@ -6054,6 +6051,9 @@ def split_dwarf_output : Separate<["-"], "split-dwarf-output">,
let Flags = [CC1Option, FC1Option, NoDriverOption] in {
+def mreassociate : Flag<["-"], "mreassociate">,
+ HelpText<"Allow reassociation transformations for floating-point instructions">,
+ MarshallingInfoFlag<LangOpts<"AllowFPReassoc">>, ImpliedByAnyOf<[funsafe_math_optimizations.KeyPath]>;
def menable_no_nans : Flag<["-"], "menable-no-nans">,
HelpText<"Allow optimization to assume there are no NaNs.">,
MarshallingInfoFlag<LangOpts<"NoHonorNaNs">>, ImpliedByAnyOf<[ffinite_math_only.KeyPath]>;
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index a5b47123b9bc4..f51972773a553 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -87,6 +87,7 @@ static void addFloatingPointOptions(const Driver &D, const ArgList &Args,
bool HonorNaNs = true;
bool ApproxFunc = false;
bool SignedZeros = true;
+ bool AssociativeMath = false;
if (const Arg *A = Args.getLastArg(options::OPT_ffp_contract)) {
const StringRef Val = A->getValue();
@@ -136,6 +137,12 @@ static void addFloatingPointOptions(const Driver &D, const ArgList &Args,
case options::OPT_fno_signed_zeros:
SignedZeros = false;
break;
+ case options::OPT_fassociative_math:
+ AssociativeMath = true;
+ break;
+ case options::OPT_fno_associative_math:
+ AssociativeMath = false;
+ break;
}
// If we handled this option claim it
@@ -156,6 +163,9 @@ static void addFloatingPointOptions(const Driver &D, const ArgList &Args,
if (!SignedZeros)
CmdArgs.push_back("-fno-signed-zeros");
+
+ if (AssociativeMath && !SignedZeros)
+ CmdArgs.push_back("-mreassociate");
}
void Flang::ConstructJob(Compilation &C, const JobAction &JA,
diff --git a/flang/include/flang/Frontend/LangOptions.def b/flang/include/flang/Frontend/LangOptions.def
index e357182f50757..059e3d18dfc8a 100644
--- a/flang/include/flang/Frontend/LangOptions.def
+++ b/flang/include/flang/Frontend/LangOptions.def
@@ -29,6 +29,8 @@ LANGOPT(NoHonorNaNs, 1, false)
LANGOPT(ApproxFunc, 1, false)
/// Allow optimizations that ignore the sign of floating point zeros
LANGOPT(NoSignedZeros, 1, false)
+/// Allow reassociation transformations for floating-point instructions
+LANGOPT(AssociativeMath, 1, false)
#undef LANGOPT
#undef ENUM_LANGOPT
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index eeadb21c19233..8c0bdcd185b6c 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -720,6 +720,12 @@ static bool parseFloatingPointArgs(CompilerInvocation &invoc,
opts.NoSignedZeros = true;
}
+ if (const llvm::opt::Arg *a =
+ args.getLastArg(clang::driver::options::OPT_mreassociate)) {
+ diags.Report(diagUnimplemented) << a->getOption().getName();
+ opts.AssociativeMath = true;
+ }
+
return true;
}
diff --git a/flang/test/Driver/driver-help.f90 b/flang/test/Driver/driver-help.f90
index 1c48ec572443e..32b6f7615deca 100644
--- a/flang/test/Driver/driver-help.f90
+++ b/flang/test/Driver/driver-help.f90
@@ -140,6 +140,7 @@
! HELP-FC1-NEXT: -mmlir <value> Additional arguments to forward to MLIR's option processing
! HELP-FC1-NEXT: -module-dir <dir> Put MODULE files in <dir>
! HELP-FC1-NEXT: -module-suffix <suffix> Use <suffix> as the suffix for module files (the default value is `.mod`)
+! HELP-FC1-NEXT: -mreassociate Allow reassociation transformations for floating-point instructions
! HELP-FC1-NEXT: -mrelocation-model <value>
! HELP-FC1-NEXT: The relocation model to use
! HELP-FC1-NEXT: -nocpp Disable predefined and command line preprocessor macros
diff --git a/flang/test/Driver/flang_fp_opts.f90 b/flang/test/Driver/flang_fp_opts.f90
index a305cddef4d2f..bbe886bcec878 100644
--- a/flang/test/Driver/flang_fp_opts.f90
+++ b/flang/test/Driver/flang_fp_opts.f90
@@ -6,9 +6,11 @@
! RUN: -menable-no-nans \
! RUN: -fapprox-func \
! RUN: -fno-signed-zeros \
+! RUN: -mreassociate \
! RUN: %s 2>&1 | FileCheck %s
! CHECK: ffp-contract= is not currently implemented
! CHECK: menable-no-infs is not currently implemented
! CHECK: menable-no-nans is not currently implemented
! CHECK: fapprox-func is not currently implemented
! CHECK: fno-signed-zeros is not currently implemented
+! CHECK: mreassociate is not currently implemented
diff --git a/flang/test/Driver/frontend-forwarding.f90 b/flang/test/Driver/frontend-forwarding.f90
index a00c45a9c154f..de3ed6ddbfca8 100644
--- a/flang/test/Driver/frontend-forwarding.f90
+++ b/flang/test/Driver/frontend-forwarding.f90
@@ -13,6 +13,7 @@
! RUN: -fno-honor-nans \
! RUN: -fapprox-func \
! RUN: -fno-signed-zeros \
+! RUN: -fassociative-math \
! RUN: -mllvm -print-before-all\
! RUN: -P \
! RUN: | FileCheck %s
@@ -28,5 +29,6 @@
! CHECK: "-menable-no-nans"
! CHECK: "-fapprox-func"
! CHECK: "-fno-signed-zeros"
+! CHECK: "-mreassociate"
! CHECK: "-fconvert=little-endian"
! CHECK: "-mllvm" "-print-before-all"
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