84 lines
1.9 KiB
Diff
84 lines
1.9 KiB
Diff
From 7f30ba9d44361296daef549fa049f579541ac5b1 Mon Sep 17 00:00:00 2001
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From: licihua <licihua@huawei.com>
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Date: Thu, 29 Dec 2022 11:22:45 +0800
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Subject: [PATCH 1/3] libvisual-0.4.0-better-altivec-detection
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---
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libvisual/lv_cpu.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 51 insertions(+)
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diff --git a/libvisual/lv_cpu.c b/libvisual/lv_cpu.c
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index 4378396..f8cb502 100644
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--- a/libvisual/lv_cpu.c
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+++ b/libvisual/lv_cpu.c
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@@ -50,8 +50,19 @@
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#endif
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#if defined(VISUAL_OS_LINUX)
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+#if defined(VISUAL_ARCH_POWERPC)
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+#include <sys/types.h>
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+#include <sys/stat.h>
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+#include <fcntl.h>
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+#include <unistd.h>
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+#include <stdio.h>
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+
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+#include <linux/auxvec.h>
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+#include <asm/cputable.h>
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+#else /* VISUAL_ARCH_POWERPC */
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#include <signal.h>
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#endif
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+#endif
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#if defined(VISUAL_OS_WIN32)
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#include <windows.h>
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@@ -154,6 +165,46 @@ static void check_os_altivec_support( void )
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if (err == 0)
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if (has_vu != 0)
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__lv_cpu_caps.hasAltiVec = 1;
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+#elif defined (VISUAL_OS_LINUX)
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+ static int available = -1;
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+ int new_avail = 0;
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+ char fname[64];
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+ unsigned long buf[64];
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+ ssize_t count;
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+ pid_t pid;
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+ int fd, i;
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+
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+ if (available != -1)
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+ return;
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+
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+ pid = getpid();
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+ snprintf(fname, sizeof(fname)-1, "/proc/%d/auxv", pid);
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+
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+ fd = open(fname, O_RDONLY);
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+ if (fd < 0)
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+ goto out;
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+more:
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+ count = read(fd, buf, sizeof(buf));
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+ if (count < 0)
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+ goto out_close;
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+
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+ for (i=0; i < (count / sizeof(unsigned long)); i += 2) {
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+ if (buf[i] == AT_HWCAP) {
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+ new_avail = !!(buf[i+1] & PPC_FEATURE_HAS_ALTIVEC);
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+ goto out_close;
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+ } else if (buf[i] == AT_NULL) {
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+ goto out_close;
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+ }
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+ }
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+
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+ if (count == sizeof(buf))
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+ goto more;
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+out_close:
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+ close(fd);
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+out:
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+ available = new_avail;
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+ if (available)
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+ __lv_cpu_caps.hasAltiVec = 1;
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#else /* !VISUAL_OS_DARWIN */
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/* no Darwin, do it the brute-force way */
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/* this is borrowed from the libmpeg2 library */
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--
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2.26.2
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