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check for __has_attribute(x) and/or clang instead of only basing existence on ZEND_GCC_VERSION #21622

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check for __has_attribute(x) and/or clang instead of only basing existence on ZEND_GCC_VERSION #21622

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99c5aa3
check for __has_attribute(x) instead of only basing existence on ZEND…
henderkes Apr 3, 2026
778bdd5
@arnaud-lb suggestion, define HAVE_ZEND_CPU_SUPPORTS_CLDEMOTE to dedu…
henderkes Apr 3, 2026
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7 changes: 4 additions & 3 deletions Zend/zend_cpuinfo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -273,7 +273,7 @@ static zend_always_inline int zend_cpu_supports_avx512_vbmi(void) {
#endif

/* __builtin_cpu_supports has pclmul from gcc9 */
#if defined(PHP_HAVE_BUILTIN_CPU_SUPPORTS) && (!defined(__GNUC__) || (ZEND_GCC_VERSION >= 9000))
#if defined(PHP_HAVE_BUILTIN_CPU_SUPPORTS) && (!defined(__GNUC__) || defined(__clang__) || (ZEND_GCC_VERSION >= 9000))
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@henderkes henderkes Apr 3, 2026

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this has existed in clang since basically forever, I went back all the way to version 5 and it's supported there

ZEND_NO_SANITIZE_ADDRESS
static inline int zend_cpu_supports_pclmul(void) {
#ifdef PHP_HAVE_BUILTIN_CPU_INIT
Expand All @@ -287,8 +287,9 @@ static inline int zend_cpu_supports_pclmul(void) {
}
#endif

/* __builtin_cpu_supports has cldemote from gcc11 */
#if defined(PHP_HAVE_BUILTIN_CPU_SUPPORTS) && defined(__GNUC__) && (ZEND_GCC_VERSION >= 11000)
/* __builtin_cpu_supports has cldemote from gcc11 and clang 19 */
#if defined(PHP_HAVE_BUILTIN_CPU_SUPPORTS) && ((defined(__clang__) && (__clang_major__ >= 19)) || (!defined(__clang__) && defined(__GNUC__) && (ZEND_GCC_VERSION >= 11000)))
#define HAVE_ZEND_CPU_SUPPORTS_CLDEMOTE 1
ZEND_NO_SANITIZE_ADDRESS
static inline int zend_cpu_supports_cldemote(void) {
#ifdef PHP_HAVE_BUILTIN_CPU_INIT
Expand Down
10 changes: 5 additions & 5 deletions Zend/zend_portability.h
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Expand Up @@ -272,7 +272,7 @@ char *alloca();
# define ZEND_ATTRIBUTE_NODISCARD
#endif

#if ZEND_GCC_VERSION >= 3000
#if ZEND_GCC_VERSION >= 3000 || __has_attribute(const)
# define ZEND_ATTRIBUTE_CONST __attribute__((const))
#else
# define ZEND_ATTRIBUTE_CONST
Expand Down Expand Up @@ -314,7 +314,7 @@ char *alloca();
# define ZEND_ATTRIBUTE_NONNULL_ARGS(...)
#endif

#if defined(__GNUC__) && ZEND_GCC_VERSION >= 4003
#if (defined(__GNUC__) && ZEND_GCC_VERSION >= 4003) || __has_attribute(cold)
# define ZEND_COLD __attribute__((cold))
# ifdef __OPTIMIZE__
# define ZEND_OPT_SIZE __attribute__((optimize("Os")))
Expand All @@ -329,7 +329,7 @@ char *alloca();
# define ZEND_OPT_SPEED
#endif

#if defined(__GNUC__) && ZEND_GCC_VERSION >= 5000
#if (defined(__GNUC__) && ZEND_GCC_VERSION >= 5000) || (__has_attribute(unused) && __has_attribute(cold))
# define ZEND_ATTRIBUTE_UNUSED_LABEL __attribute__((unused));
# define ZEND_ATTRIBUTE_COLD_LABEL __attribute__((cold));
#else
Expand Down Expand Up @@ -653,7 +653,7 @@ extern "C++" {
#endif

/* Do not use for conditional declaration of API functions! */
#if defined(ZEND_INTRIN_PCLMUL_RESOLVER) && defined(ZEND_INTRIN_HAVE_IFUNC_TARGET) && (!defined(__GNUC__) || (ZEND_GCC_VERSION >= 9000))
#if defined(ZEND_INTRIN_PCLMUL_RESOLVER) && defined(ZEND_INTRIN_HAVE_IFUNC_TARGET) && (!defined(__GNUC__) || defined(__clang__) || (ZEND_GCC_VERSION >= 9000))
/* __builtin_cpu_supports has pclmul from gcc9 */
# define ZEND_INTRIN_PCLMUL_FUNC_PROTO 1
#elif defined(ZEND_INTRIN_PCLMUL_RESOLVER)
Expand All @@ -679,7 +679,7 @@ extern "C++" {
#endif

/* Do not use for conditional declaration of API functions! */
#if defined(ZEND_INTRIN_SSE4_2_PCLMUL_RESOLVER) && defined(ZEND_INTRIN_HAVE_IFUNC_TARGET) && (!defined(__GNUC__) || (ZEND_GCC_VERSION >= 9000))
#if defined(ZEND_INTRIN_SSE4_2_PCLMUL_RESOLVER) && defined(ZEND_INTRIN_HAVE_IFUNC_TARGET) && (!defined(__GNUC__) || defined(__clang__) || (ZEND_GCC_VERSION >= 9000))
/* __builtin_cpu_supports has pclmul from gcc9 */
# define ZEND_INTRIN_SSE4_2_PCLMUL_FUNC_PROTO 1
#elif defined(ZEND_INTRIN_SSE4_2_PCLMUL_RESOLVER)
Expand Down
3 changes: 2 additions & 1 deletion ext/opcache/jit/zend_jit_ir.c
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Expand Up @@ -16,6 +16,7 @@
* +----------------------------------------------------------------------+
*/

#include "Zend/zend_cpuinfo.h"
#include "Zend/zend_types.h"
#include "Zend/zend_type_info.h"
#include "jit/ir/ir.h"
Expand Down Expand Up @@ -3396,7 +3397,7 @@ static void zend_jit_setup(bool reattached)
if (zend_cpu_supports_avx()) {
allowed_opt_flags |= ZEND_JIT_CPU_AVX;
}
# if defined(PHP_HAVE_BUILTIN_CPU_SUPPORTS) && defined(__GNUC__) && (ZEND_GCC_VERSION >= 11000)
# ifdef HAVE_ZEND_CPU_SUPPORTS_CLDEMOTE
if (zend_cpu_supports_cldemote()) {
default_mflags |= IR_X86_CLDEMOTE;
}
Expand Down
2 changes: 1 addition & 1 deletion ext/opcache/zend_shared_alloc.h
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Expand Up @@ -166,7 +166,7 @@ typedef union _align_test {
zend_long lng;
} align_test;

#if ZEND_GCC_VERSION >= 2000
#if ZEND_GCC_VERSION >= 2000 || defined(__clang__)
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@arnaud-lb arnaud-lb Apr 3, 2026

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Possibly for a follow-up, but we could define C23's alignof in zend_portability.h, and then use it here:

#if !defined(alignof)
# if ZEND_GCC_VERSION >= 2000 || defined(__clang__)
#  define alignof(x) __alignof__(x)
# endif
#endif

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@henderkes henderkes Apr 3, 2026

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What if we use MSVC to compile and aren't in C23 mode? It won't be defined at all, so we couldn't use it directly. I think that's for a follow up PR.

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@arnaud-lb arnaud-lb Apr 3, 2026

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Yes you would still need an #ifdef alignof

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@henderkes henderkes Apr 4, 2026

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Thinking about this, I don't think it makes sense. __alignof__ and alignof don't function the same way. We can however use alignof here if it exists.

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@henderkes henderkes Apr 4, 2026

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#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
# define PLATFORM_ALIGNMENT (alignof(align_test) < 8 ? 8 : alignof(align_test))
#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
# define PLATFORM_ALIGNMENT (_Alignof(align_test) < 8 ? 8 : _Alignof(align_test))
#elif ZEND_GCC_VERSION >= 2000 || defined(__clang__)
# define PLATFORM_ALIGNMENT (__alignof__(align_test) < 8 ? 8 : __alignof__(align_test))
#else
# define PLATFORM_ALIGNMENT (sizeof(align_test))
#endif

we could do this? It's a bit silly, but I don't want to use deprecated _Alignof in C23+

# define PLATFORM_ALIGNMENT (__alignof__(align_test) < 8 ? 8 : __alignof__(align_test))
#else
# define PLATFORM_ALIGNMENT (sizeof(align_test))
Expand Down
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