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math: extend non-glibc guard to Clang and add exp10 guard #1400

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Merged
mr-c merged 1 commit into from
Mar 30, 2026
+17 −14
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math: extend non-glibc guard to Clang and add exp10 guard #1400

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31 changes: 17 additions & 14 deletions simde/simde-math.h
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Original file line number Diff line number Diff line change
Expand Up @@ -973,13 +973,18 @@ simde_math_fpclass(double v, const int imm8) {
#endif
#endif

#if HEDLEY_HAS_BUILTIN(__builtin_exp10) || HEDLEY_GCC_VERSION_CHECK(3,4,0)
/* __builtin_exp10 lowers to exp10() which is a GNU extension available
* only in glibc. Other libcs (musl, OpenBSD, FreeBSD, MinGW, etc.)
* lack the symbol and produce a link error. Fall back to pow(10, v). */
#if (HEDLEY_HAS_BUILTIN(__builtin_exp10) || HEDLEY_GCC_VERSION_CHECK(3,4,0)) && \
defined(__GLIBC__)
# define simde_math_exp10(v) __builtin_exp10(v)
#else
# define simde_math_exp10(v) simde_math_pow(10.0, (v))
#endif

#if HEDLEY_HAS_BUILTIN(__builtin_exp10f) || HEDLEY_GCC_VERSION_CHECK(3,4,0)
#if (HEDLEY_HAS_BUILTIN(__builtin_exp10f) || HEDLEY_GCC_VERSION_CHECK(3,4,0)) && \
defined(__GLIBC__)
# define simde_math_exp10f(v) __builtin_exp10f(v)
#else
# define simde_math_exp10f(v) simde_math_powf(10.0f, (v))
Expand Down Expand Up @@ -1266,17 +1271,16 @@ simde_math_fpclass(double v, const int imm8) {
#endif

#if !defined(simde_math_roundeven)
/* GCC 10+ lowers __builtin_roundeven to a libm roundeven() call when
* the target has no native instruction. roundeven() is C23 and only
* available in glibc >= 2.25; other platforms (musl, OpenBSD, MinGW,
* etc.) lack the symbol and produce a link error. Clang lowers the
* builtin to an llvm.roundeven.* intrinsic which is always emitted
* inline (no libm dependency), so the GCC guard is not needed there. */
/* __builtin_roundeven lowers to a roundeven() libm call on targets
* without a native rounding instruction (x86 without SSE4.1,
* powerpc, sparc, i386, etc.). roundeven() is C23 and only
* available in glibc >= 2.25; other libcs (musl, OpenBSD, FreeBSD,
* MinGW, etc.) lack the symbol and produce a link error. Guard for
* all compilers: non-glibc platforms use the inline fallback below. */
#if \
((!defined(HEDLEY_EMSCRIPTEN_VERSION) || HEDLEY_EMSCRIPTEN_VERSION_CHECK(3, 1, 43)) && \
HEDLEY_HAS_BUILTIN(__builtin_roundeven) && \
(!HEDLEY_GCC_VERSION_CHECK(10,0,0) || \
(defined(__GLIBC__) && ((__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25)))))
(defined(__GLIBC__) && ((__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25))))
#define simde_math_roundeven(v) __builtin_roundeven(v)
#elif defined(simde_math_round) && defined(simde_math_fabs)
static HEDLEY_INLINE
Expand All @@ -1295,13 +1299,12 @@ simde_math_fpclass(double v, const int imm8) {

#if !defined(simde_math_roundevenf)
/* Same rationale as simde_math_roundeven above; applies to the float
* variant. GCC 10+ requires glibc >= 2.25 for roundevenf(); Clang
* is always safe via llvm.roundeven.f32 inline expansion. */
* variant. Both GCC and Clang emit a roundevenf() libm call on
* targets without a native instruction. */
#if \
((!defined(HEDLEY_EMSCRIPTEN_VERSION) || HEDLEY_EMSCRIPTEN_VERSION_CHECK(3, 1, 43)) && \
HEDLEY_HAS_BUILTIN(__builtin_roundevenf) && \
(!HEDLEY_GCC_VERSION_CHECK(10,0,0) || \
(defined(__GLIBC__) && ((__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25)))))
(defined(__GLIBC__) && ((__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25))))
#define simde_math_roundevenf(v) __builtin_roundevenf(v)
#elif defined(simde_math_roundf) && defined(simde_math_fabsf)
static HEDLEY_INLINE
Expand Down
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