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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)
This commit is contained in:
A. Wilcox 2025-05-04 15:01:25 -05:00 • committed by Sam Lantinga
parent 157f894d5d
commit 17e6208c1b
1 changed files with 3 additions and 1 deletions
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4
src/cpuinfo/SDL_cpuinfo.c
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@ -127,7 +127,7 @@
#define CPU_CFG2_LSX (1 << 6)
#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...
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));
altivec = cpufeatures & PPC_FEATURE_HAS_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)
void (*handler)(int sig);
handler = signal(SIGILL, illegal_instruction);