From 9886d897e27ac741daa92304fb0e7917ec701954 Mon Sep 17 00:00:00 2001
From: pkubaj <[EMAIL REDACTED]>
Date: Tue, 21 Sep 2021 16:23:48 +0000
Subject: [PATCH] Fix AltiVec detection on FreeBSD
The previous code was not correct, because there's no PPC_FEATURE_HAS_ALTIVEC MIB.
Instead, elf vector check should be done.
---
src/cpuinfo/SDL_cpuinfo.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/src/cpuinfo/SDL_cpuinfo.c b/src/cpuinfo/SDL_cpuinfo.c
index 0205729ae4..7f54c589e8 100644
--- a/src/cpuinfo/SDL_cpuinfo.c
+++ b/src/cpuinfo/SDL_cpuinfo.c
@@ -50,10 +50,13 @@
#endif
#if defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))
#include <sys/sysctl.h> /* For AltiVec check */
-#elif (defined(__OpenBSD__) || defined(__FreeBSD__)) && defined(__powerpc__)
+#elif defined(__OpenBSD__) && defined(__powerpc__)
#include <sys/param.h>
#include <sys/sysctl.h> /* For AltiVec check */
#include <machine/cpu.h>
+#elif defined(__FreeBSD__) && defined(__powerpc__)
+#include <machine/cpu.h>
+#include <sys/auxv.h>
#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
#include <signal.h>
#include <setjmp.h>
@@ -110,7 +113,7 @@
#define CPU_HAS_AVX512F (1 << 12)
#define CPU_HAS_ARM_SIMD (1 << 13)
-#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ && !__OpenBSD__
+#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ && !__OpenBSD__ && !__FreeBSD__
/* This is the brute force way of detecting instruction sets...
the idea is borrowed from the libmpeg2 library - thanks!
*/
@@ -314,11 +317,9 @@ CPU_haveAltiVec(void)
{
volatile int altivec = 0;
#ifndef SDL_CPUINFO_DISABLED
-#if (defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))) || (defined(__OpenBSD__) && defined(__powerpc__)) || (defined(__FreeBSD__) && defined(__powerpc__))
+#if (defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))) || (defined(__OpenBSD__) && defined(__powerpc__))
#ifdef __OpenBSD__
int selectors[2] = { CTL_MACHDEP, CPU_ALTIVEC };
-#elif defined(__FreeBSD__)
- int selectors[2] = { CTL_HW, PPC_FEATURE_HAS_ALTIVEC };
#else
int selectors[2] = { CTL_HW, HW_VECTORUNIT };
#endif
@@ -327,6 +328,11 @@ CPU_haveAltiVec(void)
int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
if (0 == error)
altivec = (hasVectorUnit != 0);
+#elif defined(__FreeBSD__) && defined(__powerpc__)
+ unsigned long cpufeatures = 0;
+ elf_aux_info(AT_HWCAP, &cpufeatures, sizeof(cpufeatures));
+ altivec = cpufeatures & PPC_FEATURE_HAS_ALTIVEC;
+ return altivec;
#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
void (*handler) (int sig);
handler = signal(SIGILL, illegal_instruction);