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cpuinfo: Use auxv for AltiVec on Linux if possible

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The SIGILL handler is not very reliable and can cause crashes.

Linux provides the CPU's AltiVec support status in getauxval.

(cherry picked from commit 7490471796)
(cherry picked from commit 17e6208c1b)
This commit is contained in:
A. Wilcox authored and Sam Lantinga committed 2025-05-04 14:02:12 -07:00
1 parent 84081d884b
commit 4ed1fc5bff
1 file changed
+3 -1
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src/cpuinfo/SDL_cpuinfo.c
+3 -1
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@@ -127,7 +127,7 @@
#define CPU_CFG2_LSX (1 << 6) #define CPU_CFG2_LSX (1 << 6)
#define CPU_CFG2_LASX (1 << 7) #define CPU_CFG2_LASX (1 << 7)
#if defined(SDL_ALTIVEC_BLITTERS) && defined(HAVE_SETJMP) && !defined(__MACOSX__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) #if defined(SDL_ALTIVEC_BLITTERS) && defined(HAVE_SETJMP) && !defined(__MACOSX__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && (defined(__LINUX__) && !defined(HAVE_GETAUXVAL))
/* This is the brute force way of detecting instruction sets... /* This is the brute force way of detecting instruction sets...
the idea is borrowed from the libmpeg2 library - thanks! the idea is borrowed from the libmpeg2 library - thanks!
*/ */
@@ -356,6 +356,8 @@ static int CPU_haveAltiVec(void)
elf_aux_info(AT_HWCAP, &cpufeatures, sizeof(cpufeatures)); elf_aux_info(AT_HWCAP, &cpufeatures, sizeof(cpufeatures));
altivec = cpufeatures & PPC_FEATURE_HAS_ALTIVEC; altivec = cpufeatures & PPC_FEATURE_HAS_ALTIVEC;
return altivec; return altivec;
#elif defined(__LINUX__) && defined(__powerpc__) && defined(HAVE_GETAUXVAL)
altivec = getauxval(AT_HWCAP) & PPC_FEATURE_HAS_ALTIVEC;
#elif defined(SDL_ALTIVEC_BLITTERS) && defined(HAVE_SETJMP) #elif defined(SDL_ALTIVEC_BLITTERS) && defined(HAVE_SETJMP)
void (*handler)(int sig); void (*handler)(int sig);
handler = signal(SIGILL, illegal_instruction); handler = signal(SIGILL, illegal_instruction);