diff options
| -rw-r--r-- | src/gallium/auxiliary/util/u_cpu_detect.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/src/gallium/auxiliary/util/u_cpu_detect.c b/src/gallium/auxiliary/util/u_cpu_detect.c index 4e71041bc9a..6a59f271a83 100644 --- a/src/gallium/auxiliary/util/u_cpu_detect.c +++ b/src/gallium/auxiliary/util/u_cpu_detect.c @@ -132,16 +132,32 @@ check_os_altivec_support(void) if (setjmp(__lv_powerpc_jmpbuf)) { signal(SIGILL, SIG_DFL); } else { - __lv_powerpc_canjump = 1; + boolean enable_altivec = TRUE; /* Default: enable if available, and if not overridden */ +#ifdef DEBUG + /* Disabling Altivec code generation is not the same as disabling VSX code generation, + * which can be done simply by passing -mattr=-vsx to the LLVM compiler; cf. + * lp_build_create_jit_compiler_for_module(). + * If you want to disable Altivec code generation, the best place to do it is here. + */ + char *env_control = getenv("GALLIVM_ALTIVEC"); /* 1=enable (default); 0=disable */ + if (env_control && env_control[0] == '0') { + enable_altivec = FALSE; + } +#endif + if (enable_altivec) { + __lv_powerpc_canjump = 1; - __asm __volatile - ("mtspr 256, %0\n\t" - "vand %%v0, %%v0, %%v0" - : - : "r" (-1)); + __asm __volatile + ("mtspr 256, %0\n\t" + "vand %%v0, %%v0, %%v0" + : + : "r" (-1)); - signal(SIGILL, SIG_DFL); - util_cpu_caps.has_altivec = 1; + signal(SIGILL, SIG_DFL); + util_cpu_caps.has_altivec = 1; + } else { + util_cpu_caps.has_altivec = 0; + } } #endif /* !PIPE_OS_APPLE */ } |