diff options
Diffstat (limited to 'intern')
| -rw-r--r-- | intern/cycles/util/math.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/intern/cycles/util/math.h b/intern/cycles/util/math.h index 2bfd4ba19b6..5f047f6f3f4 100644 --- a/intern/cycles/util/math.h +++ b/intern/cycles/util/math.h @@ -935,9 +935,15 @@ ccl_device_inline uint prev_power_of_two(uint x) ccl_device_inline uint32_t reverse_integer_bits(uint32_t x) { /* Use a native instruction if it exists. */ -#if defined(__arm__) || defined(__aarch64__) +#if defined(__aarch64__) || defined(_M_ARM64) + /* Assume the rbit is always available on 64bit ARM architecture. */ __asm__("rbit %w0, %w1" : "=r"(x) : "r"(x)); return x; +#elif defined(__arm__) && ((__ARM_ARCH > 7) || __ARM_ARCH == 6 && __ARM_ARCH_ISA_THUMB >= 2) + /* This ARM instruction is available in ARMv6T2 and above. + * This 32-bit Thumb instruction is available in ARMv6T2 and above. */ + __asm__("rbit %0, %1" : "=r"(x) : "r"(x)); + return x; #elif defined(__KERNEL_CUDA__) return __brev(x); #elif defined(__KERNEL_METAL__) |