[flang-commits] [flang] [flang] Warn when F128 is unsupported (PR #102147)
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Tue Aug 27 06:19:09 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-flang-semantics
Author: Tom Eccles (tblah)
<details>
<summary>Changes</summary>
This generates `warning: REAL(KIND=16) is not an enabled type for this target` if that type is used in a build not correctly configured to support this type. Uses of `selected_real_kind(30)` return -1.
The added braces to the previous if statement are so that clang-format does not try to indent the new comment. Even if the clang-format off directive is moved to the start, that comment still gets indented so it looks weird. I chose to disable clang-format for the preprocessor block to allow the nested if statement to be indented for clarity.
Note: some lit tests will fail on systems not configured to support f128. I'll update them once we are settled on what the right error message is.
Closes #<!-- -->101207
---
Full diff: https://github.com/llvm/llvm-project/pull/102147.diff
13 Files Affected:
- (modified) flang/include/flang/Tools/TargetSetup.h (+18-1)
- (modified) flang/module/ieee_arithmetic.f90 (+49)
- (modified) flang/test/CMakeLists.txt (+10)
- (modified) flang/test/Evaluate/folding07.f90 (+1)
- (modified) flang/test/Lower/Intrinsics/ieee_class_queries.f90 (+1)
- (modified) flang/test/Lower/Intrinsics/ieee_unordered.f90 (+1)
- (modified) flang/test/Lower/common-block.f90 (+1-1)
- (modified) flang/test/Semantics/kinds03.f90 (+1)
- (modified) flang/test/Semantics/modfile26.f90 (+1)
- (modified) flang/test/Semantics/realkinds-aarch64-01.f90 (+1)
- (modified) flang/test/lit.cfg.py (+2-1)
- (modified) flang/test/lit.site.cfg.py.in (+1)
- (modified) flang/tools/f18/CMakeLists.txt (+24-1)
``````````diff
diff --git a/flang/include/flang/Tools/TargetSetup.h b/flang/include/flang/Tools/TargetSetup.h
index 238d66c9241dd0..60609de8809cf0 100644
--- a/flang/include/flang/Tools/TargetSetup.h
+++ b/flang/include/flang/Tools/TargetSetup.h
@@ -11,6 +11,7 @@
#include "flang/Evaluate/target.h"
#include "llvm/Target/TargetMachine.h"
+#include <cfloat>
namespace Fortran::tools {
@@ -21,9 +22,25 @@ namespace Fortran::tools {
const llvm::Triple &targetTriple{targetMachine.getTargetTriple()};
// FIXME: Handle real(3) ?
- if (targetTriple.getArch() != llvm::Triple::ArchType::x86_64)
+ if (targetTriple.getArch() != llvm::Triple::ArchType::x86_64) {
targetCharacteristics.DisableType(
Fortran::common::TypeCategory::Real, /*kind=*/10);
+ }
+
+ // Figure out if we can support F128: see
+ // flang/runtime/Float128Math/math-entries.h
+#ifdef FLANG_RUNTIME_F128_MATH_LIB
+ // we can use libquadmath wrappers
+ constexpr bool f128Support = true;
+#elif LDBL_MANT_DIG == 113
+ // we can use libm wrappers
+ constexpr bool f128Support = true;
+#else
+ constexpr bool f128Support = false;
+#endif
+
+ if constexpr (!f128Support)
+ targetCharacteristics.DisableType(Fortran::common::TypeCategory::Real, 16);
targetCharacteristics.set_compilerOptionsString(compilerOptions)
.set_compilerVersionString(compilerVersion);
diff --git a/flang/module/ieee_arithmetic.f90 b/flang/module/ieee_arithmetic.f90
index 7c7721d78c1ed3..32e640b9e24574 100644
--- a/flang/module/ieee_arithmetic.f90
+++ b/flang/module/ieee_arithmetic.f90
@@ -161,6 +161,8 @@ end function ieee_round_ne
G(1) G(2) G(4) G(8) G(16)
#define SPECIFICS_L(G) \
G(1) G(2) G(4) G(8)
+
+#if FLANG_SUPPORT_R16
#if __x86_64__
#define SPECIFICS_R(G) \
G(2) G(3) G(4) G(8) G(10) G(16)
@@ -168,12 +170,24 @@ end function ieee_round_ne
#define SPECIFICS_R(G) \
G(2) G(3) G(4) G(8) G(16)
#endif
+#else
+#if __x86_64__
+#define SPECIFICS_R(G) \
+ G(2) G(3) G(4) G(8) G(10)
+#else
+#define SPECIFICS_R(G) \
+ G(2) G(3) G(4) G(8)
+#endif
+#endif
+
#define SPECIFICS_II(G) \
G(1,1) G(1,2) G(1,4) G(1,8) G(1,16) \
G(2,1) G(2,2) G(2,4) G(2,8) G(2,16) \
G(4,1) G(4,2) G(4,4) G(4,8) G(4,16) \
G(8,1) G(8,2) G(8,4) G(8,8) G(8,16) \
G(16,1) G(16,2) G(16,4) G(16,8) G(16,16)
+
+#if FLANG_SUPPORT_R16
#if __x86_64__
#define SPECIFICS_RI(G) \
G(2,1) G(2,2) G(2,4) G(2,8) G(2,16) \
@@ -190,7 +204,24 @@ end function ieee_round_ne
G(8,1) G(8,2) G(8,4) G(8,8) G(8,16) \
G(16,1) G(16,2) G(16,4) G(16,8) G(16,16)
#endif
+#else
+#if __x86_64__
+#define SPECIFICS_RI(G) \
+ G(2,1) G(2,2) G(2,4) G(2,8) \
+ G(3,1) G(3,2) G(3,4) G(3,8) \
+ G(4,1) G(4,2) G(4,4) G(4,8) \
+ G(8,1) G(8,2) G(8,4) G(8,8) \
+ G(10,1) G(10,2) G(10,4) G(10,8)
+#else
+#define SPECIFICS_RI(G) \
+ G(2,1) G(2,2) G(2,4) G(2,8) \
+ G(3,1) G(3,2) G(3,4) G(3,8) \
+ G(4,1) G(4,2) G(4,4) G(4,8) \
+ G(8,1) G(8,2) G(8,4) G(8,8)
+#endif
+#endif
+#if FLANG_SUPPORT_R16
#if __x86_64__
#define SPECIFICS_RR(G) \
G(2,2) G(2,3) G(2,4) G(2,8) G(2,10) G(2,16) \
@@ -207,6 +238,22 @@ end function ieee_round_ne
G(8,2) G(8,3) G(8,4) G(8,8) G(8,16) \
G(16,2) G(16,3) G(16,4) G(16,8) G(16,16)
#endif
+#else
+#if __x86_64__
+#define SPECIFICS_RR(G) \
+ G(2,2) G(2,3) G(2,4) G(2,8) G(2,10) \
+ G(3,2) G(3,3) G(3,4) G(3,8) G(3,10) \
+ G(4,2) G(4,3) G(4,4) G(4,8) G(4,10) \
+ G(8,2) G(8,3) G(8,4) G(8,8) G(8,10) \
+ G(10,2) G(10,3) G(10,4) G(10,8) G(10,10)
+#else
+#define SPECIFICS_RR(G) \
+ G(2,2) G(2,3) G(2,4) G(2,8) \
+ G(3,2) G(3,3) G(3,4) G(3,8) \
+ G(4,2) G(4,3) G(4,4) G(4,8) \
+ G(8,2) G(8,3) G(8,4) G(8,8)
+#endif
+#endif
#define IEEE_CLASS_R(XKIND) \
elemental type(ieee_class_type) function ieee_class_a##XKIND(x); \
@@ -462,8 +509,10 @@ end function ieee_real_a##AKIND##_i##KKIND;
interface ieee_real
SPECIFICS_I(IEEE_REAL_I)
SPECIFICS_R(IEEE_REAL_R)
+#if FLANG_SUPPORT_R16
SPECIFICS_II(IEEE_REAL_II)
SPECIFICS_RI(IEEE_REAL_RI)
+#endif
end interface ieee_real
public :: ieee_real
#undef IEEE_REAL_I
diff --git a/flang/test/CMakeLists.txt b/flang/test/CMakeLists.txt
index 43ad1e3312b643..a18a5c6519eda4 100644
--- a/flang/test/CMakeLists.txt
+++ b/flang/test/CMakeLists.txt
@@ -11,6 +11,16 @@ llvm_canonicalize_cmake_booleans(
set(FLANG_TOOLS_DIR ${FLANG_BINARY_DIR}/bin)
+# Check if 128-bit float computations can be done via long double
+check_cxx_source_compiles(
+ "#include <cfloat>
+ #if LDBL_MANT_DIG != 113
+ #error LDBL_MANT_DIG != 113
+ #endif
+ int main() { return 0; }
+ "
+ HAVE_LDBL_MANT_DIG_113)
+
# FIXME In out-of-tree builds, "SHLIBDIR" is undefined and passing it to
# `configure_lit_site_cfg` leads to a configuration error. This is currently
# only required by plugins/examples, which are not supported in out-of-tree
diff --git a/flang/test/Evaluate/folding07.f90 b/flang/test/Evaluate/folding07.f90
index 3b6a99df388268..d51df7acf7b8a6 100644
--- a/flang/test/Evaluate/folding07.f90
+++ b/flang/test/Evaluate/folding07.f90
@@ -1,3 +1,4 @@
+! REQUIRES: flang-supports-f128-math
! RUN: %python %S/test_folding.py %s %flang_fc1
! Test numeric model inquiry intrinsics
diff --git a/flang/test/Lower/Intrinsics/ieee_class_queries.f90 b/flang/test/Lower/Intrinsics/ieee_class_queries.f90
index bb7787ea903e23..b2f9df83a902a0 100644
--- a/flang/test/Lower/Intrinsics/ieee_class_queries.f90
+++ b/flang/test/Lower/Intrinsics/ieee_class_queries.f90
@@ -1,3 +1,4 @@
+! REQUIRES: flang-supports-f128-math
! RUN: bbc -emit-fir -o - %s | FileCheck %s
! CHECK-LABEL: func @_QQmain
diff --git a/flang/test/Lower/Intrinsics/ieee_unordered.f90 b/flang/test/Lower/Intrinsics/ieee_unordered.f90
index a6146eff7f06e7..b7e81d53a2d750 100644
--- a/flang/test/Lower/Intrinsics/ieee_unordered.f90
+++ b/flang/test/Lower/Intrinsics/ieee_unordered.f90
@@ -1,3 +1,4 @@
+! REQUIRES: flang-supports-f128-math
! RUN: bbc -emit-fir -hlfir=false -o - %s | FileCheck %s
! CHECK-LABEL: func @_QQmain
diff --git a/flang/test/Lower/common-block.f90 b/flang/test/Lower/common-block.f90
index 94e61b8bcc33db..b5c1389df45d35 100644
--- a/flang/test/Lower/common-block.f90
+++ b/flang/test/Lower/common-block.f90
@@ -1,3 +1,4 @@
+! REQUIRES: flang-supports-f128-math
! RUN: bbc %s -o - | tco | FileCheck %s
! RUN: %flang -emit-llvm -S -mmlir -disable-external-name-interop %s -o - | FileCheck %s
@@ -78,4 +79,3 @@ subroutine s7()
real(16) r16
common /co1/ r16
end subroutine
-
diff --git a/flang/test/Semantics/kinds03.f90 b/flang/test/Semantics/kinds03.f90
index 751d4a9ffa3cbb..a15a4a9baa7315 100644
--- a/flang/test/Semantics/kinds03.f90
+++ b/flang/test/Semantics/kinds03.f90
@@ -1,3 +1,4 @@
+! REQUIRES: flang-supports-f128-math
! RUN: %python %S/test_symbols.py %s %flang_fc1
!DEF: /MainProgram1/ipdt DerivedType
!DEF: /MainProgram1/ipdt/k TypeParam INTEGER(4)
diff --git a/flang/test/Semantics/modfile26.f90 b/flang/test/Semantics/modfile26.f90
index 09dc8b0954d633..9c5d0015d91631 100644
--- a/flang/test/Semantics/modfile26.f90
+++ b/flang/test/Semantics/modfile26.f90
@@ -1,3 +1,4 @@
+! REQUIRES: flang-supports-f128-math
! RUN: %python %S/test_modfile.py %s %flang_fc1
! Intrinsics SELECTED_INT_KIND, SELECTED_REAL_KIND, PRECISION, RANGE,
! RADIX, DIGITS
diff --git a/flang/test/Semantics/realkinds-aarch64-01.f90 b/flang/test/Semantics/realkinds-aarch64-01.f90
index e22920ff991e93..2520c0b84c0e67 100644
--- a/flang/test/Semantics/realkinds-aarch64-01.f90
+++ b/flang/test/Semantics/realkinds-aarch64-01.f90
@@ -1,4 +1,5 @@
! REQUIRES: aarch64-registered-target
+! REQUIRES: flang-supports-f128-math
! RUN: %python %S/test_modfile.py %s %flang_fc1 -triple aarch64-unknown-linux-gnu
module m1
diff --git a/flang/test/lit.cfg.py b/flang/test/lit.cfg.py
index 37869e7e2ecd7e..4acbc0606d1977 100644
--- a/flang/test/lit.cfg.py
+++ b/flang/test/lit.cfg.py
@@ -216,8 +216,9 @@
# Add features and substitutions to test F128 math support.
# %f128-lib substitution may be used to generate check prefixes
# for LIT tests checking for F128 library support.
-if config.flang_runtime_f128_math_lib:
+if config.flang_runtime_f128_math_lib or config.have_ldbl_mant_dig_113:
config.available_features.add("flang-supports-f128-math")
+if config.flang_runtime_f128_math_lib:
config.available_features.add(
"flang-f128-math-lib-" + config.flang_runtime_f128_math_lib
)
diff --git a/flang/test/lit.site.cfg.py.in b/flang/test/lit.site.cfg.py.in
index fe6186d7140713..d1a0ac763cf8a0 100644
--- a/flang/test/lit.site.cfg.py.in
+++ b/flang/test/lit.site.cfg.py.in
@@ -31,6 +31,7 @@ if "openmp" in "@LLVM_ENABLE_RUNTIMES@".lower().split(";"):
else:
config.openmp_module_dir = None
config.flang_runtime_f128_math_lib = "@FLANG_RUNTIME_F128_MATH_LIB@"
+config.have_ldbl_mant_dig_113 = "@HAVE_LDBL_MANT_DIG_113@"
import lit.llvm
lit.llvm.initialize(lit_config, config)
diff --git a/flang/tools/f18/CMakeLists.txt b/flang/tools/f18/CMakeLists.txt
index cec4e2d8107206..344a781c41e957 100644
--- a/flang/tools/f18/CMakeLists.txt
+++ b/flang/tools/f18/CMakeLists.txt
@@ -31,6 +31,25 @@ set(MODULES_WITHOUT_IMPLEMENTATION
set(MODULES ${MODULES_WITH_IMPLEMENTATION} ${MODULES_WITHOUT_IMPLEMENTATION})
+# Check if 128-bit float computations can be done via long double.
+check_cxx_source_compiles(
+ "#include <cfloat>
+ #if LDBL_MANT_DIG != 113
+ #error LDBL_MANT_DIG != 113
+ #endif
+ int main() { return 0; }
+ "
+ HAVE_LDBL_MANT_DIG_113)
+
+# Figure out whether we can support REAL(KIND=16)
+if (FLANG_RUNTIME_F128_MATH_LIB)
+ set(FLANG_SUPPORT_R16 "1")
+elseif (HAVE_LDBL_MANT_DIG_113)
+ set(FLANG_SUPPORT_R16 "1")
+else()
+ set(FLANG_SUPPORT_R16 "0")
+endif()
+
# Init variable to hold extra object files coming from the Fortran modules;
# these module files will be contributed from the CMakeLists in flang/tools/f18.
set(module_objects "")
@@ -76,6 +95,10 @@ if (NOT CMAKE_CROSSCOMPILING)
endif()
endif()
+ set(decls "")
+ if (FLANG_SUPPORT_R16)
+ set(decls "-DFLANG_SUPPORT_R16")
+ endif()
# Some modules have an implementation part that needs to be added to the
# FortranRuntime library.
@@ -92,7 +115,7 @@ if (NOT CMAKE_CROSSCOMPILING)
# TODO: We may need to flag this with conditional, in case Flang is built w/o OpenMP support
add_custom_command(OUTPUT ${base}.mod ${object_output}
COMMAND ${CMAKE_COMMAND} -E make_directory ${FLANG_INTRINSIC_MODULES_DIR}
- COMMAND flang-new ${opts} -cpp ${compile_with} -module-dir ${FLANG_INTRINSIC_MODULES_DIR}
+ COMMAND flang-new ${opts} ${decls} -cpp ${compile_with} -module-dir ${FLANG_INTRINSIC_MODULES_DIR}
${FLANG_SOURCE_DIR}/module/${filename}.f90
DEPENDS flang-new ${FLANG_SOURCE_DIR}/module/${filename}.f90 ${FLANG_SOURCE_DIR}/module/__fortran_builtins.f90 ${depends}
)
``````````
</details>
https://github.com/llvm/llvm-project/pull/102147
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