diff options
| -rwxr-xr-x | configure | 4 | ||||
| -rw-r--r-- | libavutil/arm/cpu.c | 83 |
2 files changed, 86 insertions, 1 deletions
@@ -3161,7 +3161,9 @@ EOF enabled vfp && check_insn vfp 'fadds s0, s0, s0' enabled vfpv3 && check_insn vfpv3 'vmov.f32 s0, #1.0' - map 'enabled_any ${v}_external ${v}_inline || disable $v' $ARCH_EXT_LIST_ARM + [ $target_os = linux ] || + map 'enabled_any ${v}_external ${v}_inline || disable $v' \ + $ARCH_EXT_LIST_ARM check_inline_asm asm_mod_q '"add r0, %Q0, %R0" :: "r"((long long)0)' check_inline_asm asm_mod_y '"vmul.i32 d0, d0, %y0" :: "x"(0)' diff --git a/libavutil/arm/cpu.c b/libavutil/arm/cpu.c index 7058aeb1f1..041afc985a 100644 --- a/libavutil/arm/cpu.c +++ b/libavutil/arm/cpu.c @@ -19,6 +19,87 @@ #include "libavutil/cpu.h" #include "config.h" +#define CORE_FLAG(f) \ + (AV_CPU_FLAG_ ## f * (HAVE_ ## f ## _EXTERNAL || HAVE_ ## f ## _INLINE)) + +#define CORE_CPU_FLAGS \ + (CORE_FLAG(ARMV5TE) | \ + CORE_FLAG(ARMV6) | \ + CORE_FLAG(ARMV6T2) | \ + CORE_FLAG(VFP) | \ + CORE_FLAG(VFPV3) | \ + CORE_FLAG(NEON)) + +#if defined __linux__ || defined __ANDROID__ + +#include <stdint.h> +#include <stdio.h> + +#define AT_HWCAP 16 + +/* Relevant HWCAP values from kernel headers */ +#define HWCAP_VFP (1 << 6) +#define HWCAP_EDSP (1 << 7) +#define HWCAP_THUMBEE (1 << 11) +#define HWCAP_NEON (1 << 12) +#define HWCAP_VFPv3 (1 << 13) +#define HWCAP_TLS (1 << 15) + +static int get_hwcap(uint32_t *hwcap) +{ + struct { uint32_t a_type; uint32_t a_val; } auxv; + FILE *f = fopen("/proc/self/auxv", "r"); + int err = -1; + + if (!f) + return -1; + + while (fread(&auxv, sizeof(auxv), 1, f) > 0) { + if (auxv.a_type == AT_HWCAP) { + *hwcap = auxv.a_val; + err = 0; + break; + } + } + + fclose(f); + return err; +} + +int ff_get_cpu_flags_arm(void) +{ + int flags = CORE_CPU_FLAGS; + uint32_t hwcap; + + if (get_hwcap(&hwcap) < 0) + return flags; + +#define check_cap(cap, flag) do { \ + if (hwcap & HWCAP_ ## cap) \ + flags |= AV_CPU_FLAG_ ## flag; \ + } while (0) + + /* No flags explicitly indicate v6 or v6T2 so check others which + imply support. */ + check_cap(EDSP, ARMV5TE); + check_cap(TLS, ARMV6); + check_cap(THUMBEE, ARMV6T2); + check_cap(VFP, VFP); + check_cap(VFPv3, VFPV3); + check_cap(NEON, NEON); + + /* The v6 checks above are not reliable so let higher flags + trickle down. */ + if (flags & (AV_CPU_FLAG_VFPV3 | AV_CPU_FLAG_NEON)) + flags |= AV_CPU_FLAG_ARMV6T2; + if (flags & AV_CPU_FLAG_ARMV6T2) + flags |= AV_CPU_FLAG_ARMV6; + + return flags; +} + +#else + int ff_get_cpu_flags_arm(void) { return AV_CPU_FLAG_ARMV5TE * HAVE_ARMV5TE | @@ -28,3 +109,5 @@ int ff_get_cpu_flags_arm(void) AV_CPU_FLAG_VFPV3 * HAVE_VFPV3 | AV_CPU_FLAG_NEON * HAVE_NEON; } + +#endif |