diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/auxiliary/util/u_cpu_detect.c | 120 |
1 files changed, 1 insertions, 119 deletions
diff --git a/src/gallium/auxiliary/util/u_cpu_detect.c b/src/gallium/auxiliary/util/u_cpu_detect.c index 50563513072..b9b9f9257af 100644 --- a/src/gallium/auxiliary/util/u_cpu_detect.c +++ b/src/gallium/auxiliary/util/u_cpu_detect.c @@ -194,123 +194,8 @@ check_os_altivec_support(void) } #endif /* PIPE_ARCH_PPC */ -/* If we're running on a processor that can do SSE, let's see if we - * are allowed to or not. This will catch 2.4.0 or later kernels that - * haven't been configured for a Pentium III but are running on one, - * and RedHat patched 2.2 kernels that have broken exception handling - * support for user space apps that do SSE. - */ -#if defined(PIPE_ARCH_X86) || defined (PIPE_ARCH_X86_64) -static void -check_os_katmai_support(void) -{ -#if defined(PIPE_ARCH_X86) -#if defined(PIPE_OS_FREEBSD) - int has_sse=0, ret; - int len = sizeof (has_sse); - - ret = sysctlbyname("hw.instruction_sse", &has_sse, &len, NULL, 0); - if (ret || !has_sse) - util_cpu_caps.has_sse=0; - -#elif defined(PIPE_OS_NETBSD) || defined(PIPE_OS_OPENBSD) - int has_sse, has_sse2, ret, mib[2]; - int varlen; - - mib[0] = CTL_MACHDEP; - mib[1] = CPU_SSE; - varlen = sizeof (has_sse); - - ret = sysctl(mib, 2, &has_sse, &varlen, NULL, 0); - if (ret < 0 || !has_sse) { - util_cpu_caps.has_sse = 0; - } else { - util_cpu_caps.has_sse = 1; - } - - mib[1] = CPU_SSE2; - varlen = sizeof (has_sse2); - ret = sysctl(mib, 2, &has_sse2, &varlen, NULL, 0); - if (ret < 0 || !has_sse2) { - util_cpu_caps.has_sse2 = 0; - } else { - util_cpu_caps.has_sse2 = 1; - } - util_cpu_caps.has_sse = 0; /* FIXME ?!?!? */ - -#elif defined(PIPE_OS_WINDOWS) - LPTOP_LEVEL_EXCEPTION_FILTER exc_fil; - if (util_cpu_caps.has_sse) { - exc_fil = SetUnhandledExceptionFilter(win32_sig_handler_sse); -#if defined(PIPE_CC_GCC) - __asm __volatile ("xorps %xmm0, %xmm0"); -#elif defined(PIPE_CC_MSVC) - __asm { - xorps xmm0, xmm0 /* executing SSE instruction */ - } -#else -#error Unsupported compiler -#endif - SetUnhandledExceptionFilter(exc_fil); - } -#elif defined(PIPE_OS_LINUX) - struct sigaction saved_sigill; - struct sigaction saved_sigfpe; - - /* Save the original signal handlers. - */ - sigaction(SIGILL, NULL, &saved_sigill); - sigaction(SIGFPE, NULL, &saved_sigfpe); - - signal(SIGILL, (void (*)(int))sigill_handler_sse); - signal(SIGFPE, (void (*)(int))sigfpe_handler_sse); - - /* Emulate test for OSFXSR in CR4. The OS will set this bit if it - * supports the extended FPU save and restore required for SSE. If - * we execute an SSE instruction on a PIII and get a SIGILL, the OS - * doesn't support Streaming SIMD Exceptions, even if the processor - * does. - */ - if (util_cpu_caps.has_sse) { - __asm __volatile ("xorps %xmm1, %xmm0"); - } - - /* Emulate test for OSXMMEXCPT in CR4. The OS will set this bit if - * it supports unmasked SIMD FPU exceptions. If we unmask the - * exceptions, do a SIMD divide-by-zero and get a SIGILL, the OS - * doesn't support unmasked SIMD FPU exceptions. If we get a SIGFPE - * as expected, we're okay but we need to clean up after it. - * - * Are we being too stringent in our requirement that the OS support - * unmasked exceptions? Certain RedHat 2.2 kernels enable SSE by - * setting CR4.OSFXSR but don't support unmasked exceptions. Win98 - * doesn't even support them. We at least know the user-space SSE - * support is good in kernels that do support unmasked exceptions, - * and therefore to be safe I'm going to leave this test in here. - */ - if (util_cpu_caps.has_sse) { - /* test_os_katmai_exception_support(); */ - } - - /* Restore the original signal handlers. - */ - sigaction(SIGILL, &saved_sigill, NULL); - sigaction(SIGFPE, &saved_sigfpe, NULL); - -#else - /* We can't use POSIX signal handling to test the availability of - * SSE, so we disable it by default. - */ - util_cpu_caps.has_sse = 0; -#endif /* __linux__ */ -#endif - -#if defined(PIPE_ARCH_X86_64) - util_cpu_caps.has_sse = 1; -#endif -} - +#if defined(PIPE_ARCH_X86) || defined (PIPE_ARCH_X86_64) static int has_cpuid(void) { #if defined(PIPE_ARCH_X86) @@ -469,9 +354,6 @@ util_cpu_detect(void) util_cpu_caps.cacheline = regs2[2] & 0xFF; } - if (util_cpu_caps.has_sse) - check_os_katmai_support(); - if (!util_cpu_caps.has_sse) { util_cpu_caps.has_sse2 = 0; util_cpu_caps.has_sse3 = 0; |