[AArch64] Define __FP_FAST_FMA[F]

[jolanta.jensen]

Summary

Libraries use this flag to decide whether to use the fma builtin.
Author: Paul Walker

[paulwalker-arm]

clang/test/Preprocessor/aarch64-target-features.c

59–60

I don't think we need this change given init-aarch64.c provides enough coverage.

[jolanta.jensen]

Removing an unnecessary test change from aarch64-target-features.c
as init-aarch64.c provides enough coverage.

clang/lib/Basic/Targets/AArch64.cpp

void AArch64TargetInfo::getTargetDefines(const LangOptions &Opts,
   }
 
   // All of the __sync_(bool|val)_compare_and_swap_(1|2|4|8) builtins work.
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
   Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
 
+  // Allow detection of fast FMA support.
+  Builder.defineMacro("__FP_FAST_FMA", "1");
+  Builder.defineMacro("__FP_FAST_FMAF", "1");
+
   if (Opts.VScaleMin && Opts.VScaleMin == Opts.VScaleMax) {
     Builder.defineMacro("__ARM_FEATURE_SVE_BITS", Twine(Opts.VScaleMin * 128));
     Builder.defineMacro("__ARM_FEATURE_SVE_VECTOR_OPERATORS");
   }
 }
 
 ArrayRef<Builtin::Info> AArch64TargetInfo::getTargetBuiltins() const {
   return llvm::makeArrayRef(BuiltinInfo, clang::AArch64::LastTSBuiltin -

clang/test/Preprocessor/aarch64-target-features.c

 // CHECK-NOT: __ARM_FEATURE_BF16 1
 // CHECK-NOT: __ARM_FEATURE_BF16_VECTOR_ARITHMETIC 1
 // CHECK-NOT: __ARM_FEATURE_SVE_BITS 0
 // CHECK-NOT: __ARM_FEATURE_SVE_BITS 128
 // CHECK-NOT: __ARM_FEATURE_SVE_BITS 256
 // CHECK-NOT: __ARM_FEATURE_SVE_BITS 512
 // CHECK-NOT: __ARM_FEATURE_SVE_BITS 1024
 // CHECK-NOT: __ARM_FEATURE_SVE_BITS 2048
+// CHECK: __FP_FAST_FMA 1
+// CHECK: __FP_FAST_FMAF 1
 
 // RUN: %clang -target aarch64-arm-eabi -march=armv8-r -x c -E -dM %s -o - | FileCheck %s -check-prefix CHECK-R-PROFILE
 // RUN: %clang -target arm64-none-linux-gnu -march=armv8-r -x c -E -dM %s -o - | FileCheck %s -check-prefix CHECK-R-PROFILE
 // CHECK-R-PROFILE: __ARM_ARCH_PROFILE 'R'
 
 // RUN: %clang -target aarch64-arm-eabi -x c -E -dM %s -o - | FileCheck %s -check-prefix CHECK-A-PROFILE
 // RUN: %clang -target aarch64-arm-eabi -march=armv8-a -x c -E -dM %s -o - | FileCheck %s -check-prefix CHECK-A-PROFILE
 // RUN: %clang -target arm64-none-linux-gnu -march=armv8-a -x c -E -dM %s -o - | FileCheck %s -check-prefix CHECK-A-PROFILE

clang/test/Preprocessor/init-aarch64.c

 // AARCH64-NEXT: #define __FLT_MANT_DIG__ 24
 // AARCH64-NEXT: #define __FLT_MAX_10_EXP__ 38
 // AARCH64-NEXT: #define __FLT_MAX_EXP__ 128
 // AARCH64-NEXT: #define __FLT_MAX__ 3.40282347e+38F
 // AARCH64-NEXT: #define __FLT_MIN_10_EXP__ (-37)
 // AARCH64-NEXT: #define __FLT_MIN_EXP__ (-125)
 // AARCH64-NEXT: #define __FLT_MIN__ 1.17549435e-38F
 // AARCH64-NEXT: #define __FLT_RADIX__ 2
+// AARCH64-NEXT: #define __FP_FAST_FMA 1
+// AARCH64-NEXT: #define __FP_FAST_FMAF 1
 // AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
 // AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
 // AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
 // AARCH64-NEXT: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
 // AARCH64_CXX-NEXT: #define __GLIBCXX_BITSIZE_INT_N_0 128
 // AARCH64_CXX-NEXT: #define __GLIBCXX_TYPE_INT_N_0 __int128
-// AARCH64-NEXT: #define __INT16_C_SUFFIX__ 
+// AARCH64-NEXT: #define __INT16_C_SUFFIX__
 // AARCH64-NEXT: #define __INT16_FMTd__ "hd"
 // AARCH64-NEXT: #define __INT16_FMTi__ "hi"
 // AARCH64-NEXT: #define __INT16_MAX__ 32767
 // AARCH64-NEXT: #define __INT16_TYPE__ short
-// AARCH64-NEXT: #define __INT32_C_SUFFIX__ 
+// AARCH64-NEXT: #define __INT32_C_SUFFIX__
 // AARCH64-NEXT: #define __INT32_FMTd__ "d"
 // AARCH64-NEXT: #define __INT32_FMTi__ "i"
 // AARCH64-NEXT: #define __INT32_MAX__ 2147483647
 // AARCH64-NEXT: #define __INT32_TYPE__ int
 // AARCH64-NEXT: #define __INT64_C_SUFFIX__ L
 // AARCH64-NEXT: #define __INT64_FMTd__ "ld"
 // AARCH64-NEXT: #define __INT64_FMTi__ "li"
 // AARCH64-NEXT: #define __INT64_MAX__ 9223372036854775807L
 // AARCH64-NEXT: #define __INT64_TYPE__ long int
-// AARCH64-NEXT: #define __INT8_C_SUFFIX__ 
+// AARCH64-NEXT: #define __INT8_C_SUFFIX__
 // AARCH64-NEXT: #define __INT8_FMTd__ "hhd"
 // AARCH64-NEXT: #define __INT8_FMTi__ "hhi"
 // AARCH64-NEXT: #define __INT8_MAX__ 127
 // AARCH64-NEXT: #define __INT8_TYPE__ signed char
 // AARCH64-NEXT: #define __INTMAX_C_SUFFIX__ L
 // AARCH64-NEXT: #define __INTMAX_FMTd__ "ld"
 // AARCH64-NEXT: #define __INTMAX_FMTi__ "li"
 // AARCH64-NEXT: #define __INTMAX_MAX__ 9223372036854775807L

 // AARCH64-NEXT: #define __SIZE_WIDTH__ 64
 // AARCH64_CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16UL
 // AARCH64_CXX: #define __STDCPP_THREADS__ 1
 // AARCH64-NEXT: #define __STDC_HOSTED__ 1
 // AARCH64-NEXT: #define __STDC_UTF_16__ 1
 // AARCH64-NEXT: #define __STDC_UTF_32__ 1
 // AARCH64_C: #define __STDC_VERSION__ 201710L
 // AARCH64-NEXT: #define __STDC__ 1
-// AARCH64-NEXT: #define __UINT16_C_SUFFIX__ 
+// AARCH64-NEXT: #define __UINT16_C_SUFFIX__
 // AARCH64-NEXT: #define __UINT16_FMTX__ "hX"
 // AARCH64-NEXT: #define __UINT16_FMTo__ "ho"
 // AARCH64-NEXT: #define __UINT16_FMTu__ "hu"
 // AARCH64-NEXT: #define __UINT16_FMTx__ "hx"
 // AARCH64-NEXT: #define __UINT16_MAX__ 65535
 // AARCH64-NEXT: #define __UINT16_TYPE__ unsigned short
 // AARCH64-NEXT: #define __UINT32_C_SUFFIX__ U
 // AARCH64-NEXT: #define __UINT32_FMTX__ "X"
 // AARCH64-NEXT: #define __UINT32_FMTo__ "o"
 // AARCH64-NEXT: #define __UINT32_FMTu__ "u"
 // AARCH64-NEXT: #define __UINT32_FMTx__ "x"
 // AARCH64-NEXT: #define __UINT32_MAX__ 4294967295U
 // AARCH64-NEXT: #define __UINT32_TYPE__ unsigned int
 // AARCH64-NEXT: #define __UINT64_C_SUFFIX__ UL
 // AARCH64-NEXT: #define __UINT64_FMTX__ "lX"
 // AARCH64-NEXT: #define __UINT64_FMTo__ "lo"
 // AARCH64-NEXT: #define __UINT64_FMTu__ "lu"
 // AARCH64-NEXT: #define __UINT64_FMTx__ "lx"
 // AARCH64-NEXT: #define __UINT64_MAX__ 18446744073709551615UL
 // AARCH64-NEXT: #define __UINT64_TYPE__ long unsigned int
-// AARCH64-NEXT: #define __UINT8_C_SUFFIX__ 
+// AARCH64-NEXT: #define __UINT8_C_SUFFIX__
 // AARCH64-NEXT: #define __UINT8_FMTX__ "hhX"
 // AARCH64-NEXT: #define __UINT8_FMTo__ "hho"
 // AARCH64-NEXT: #define __UINT8_FMTu__ "hhu"
 // AARCH64-NEXT: #define __UINT8_FMTx__ "hhx"
 // AARCH64-NEXT: #define __UINT8_MAX__ 255
 // AARCH64-NEXT: #define __UINT8_TYPE__ unsigned char
 // AARCH64-NEXT: #define __UINTMAX_C_SUFFIX__ UL
 // AARCH64-NEXT: #define __UINTMAX_FMTX__ "lX"

 // AARCH64-NEXT: #define __UINT_LEAST64_MAX__ 18446744073709551615UL
 // AARCH64-NEXT: #define __UINT_LEAST64_TYPE__ long unsigned int
 // AARCH64-NEXT: #define __UINT_LEAST8_FMTX__ "hhX"
 // AARCH64-NEXT: #define __UINT_LEAST8_FMTo__ "hho"
 // AARCH64-NEXT: #define __UINT_LEAST8_FMTu__ "hhu"
 // AARCH64-NEXT: #define __UINT_LEAST8_FMTx__ "hhx"
 // AARCH64-NEXT: #define __UINT_LEAST8_MAX__ 255
 // AARCH64-NEXT: #define __UINT_LEAST8_TYPE__ unsigned char
-// AARCH64-NEXT: #define __USER_LABEL_PREFIX__ 
+// AARCH64-NEXT: #define __USER_LABEL_PREFIX__
 // AARCH64-NEXT: #define __VERSION__ "{{.*}}"
 // AARCH64-NEXT: #define __WCHAR_MAX__ 4294967295U
 // AARCH64-NEXT: #define __WCHAR_TYPE__ unsigned int
 // AARCH64-NEXT: #define __WCHAR_UNSIGNED__ 1
 // AARCH64-NEXT: #define __WCHAR_WIDTH__ 32
 // AARCH64-NEXT: #define __WINT_MAX__ 2147483647
 // AARCH64-NEXT: #define __WINT_TYPE__ int
 // AARCH64-NEXT: #define __WINT_WIDTH__ 32