diff options
Diffstat (limited to 'pixman/pixman/pixman-combine32.h')
| -rw-r--r-- | pixman/pixman/pixman-combine32.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/pixman/pixman/pixman-combine32.h b/pixman/pixman/pixman-combine32.h index 875dde3cf..cdd56a61a 100644 --- a/pixman/pixman/pixman-combine32.h +++ b/pixman/pixman/pixman-combine32.h @@ -20,6 +20,47 @@ #define BLUE_8(x) ((x) & MASK) /* + * ARMv6 has UQADD8 instruction, which implements unsigned saturated + * addition for 8-bit values packed in 32-bit registers. It is very useful + * for UN8x4_ADD_UN8x4, UN8_rb_ADD_UN8_rb and ADD_UN8 macros (which would + * otherwise need a lot of arithmetic operations to simulate this operation). + * Since most of the major ARM linux distros are built for ARMv7, we are + * much less dependent on runtime CPU detection and can get practical + * benefits from conditional compilation here for a lot of users. + */ + +#if defined(USE_GCC_INLINE_ASM) && defined(__arm__) && \ + !defined(__aarch64__) && (!defined(__thumb__) || defined(__thumb2__)) +#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || \ + defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || \ + defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) || \ + defined(__ARM_ARCH_6M__) || defined(__ARM_ARCH_7__) || \ + defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || \ + defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) + +static force_inline uint32_t +un8x4_add_un8x4 (uint32_t x, uint32_t y) +{ + uint32_t t; + asm ("uqadd8 %0, %1, %2" : "=r" (t) : "%r" (x), "r" (y)); + return t; +} + +#define UN8x4_ADD_UN8x4(x, y) \ + ((x) = un8x4_add_un8x4 ((x), (y))) + +#define UN8_rb_ADD_UN8_rb(x, y, t) \ + ((t) = un8x4_add_un8x4 ((x), (y)), (x) = (t)) + +#define ADD_UN8(x, y, t) \ + ((t) = (x), un8x4_add_un8x4 ((t), (y))) + +#endif +#endif + +/*****************************************************************************/ + +/* * Helper macros. */ @@ -29,9 +70,11 @@ #define DIV_UN8(a, b) \ (((uint16_t) (a) * MASK + ((b) / 2)) / (b)) +#ifndef ADD_UN8 #define ADD_UN8(x, y, t) \ ((t) = (x) + (y), \ (uint32_t) (uint8_t) ((t) | (0 - ((t) >> G_SHIFT)))) +#endif #define DIV_ONE_UN8(x) \ (((x) + ONE_HALF + (((x) + ONE_HALF) >> G_SHIFT)) >> G_SHIFT) @@ -56,6 +99,7 @@ /* * x_rb = min (x_rb + y_rb, 255) */ +#ifndef UN8_rb_ADD_UN8_rb #define UN8_rb_ADD_UN8_rb(x, y, t) \ do \ { \ @@ -63,6 +107,7 @@ t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK); \ x = (t & RB_MASK); \ } while (0) +#endif /* * x_rb = (x_rb * a_rb) / 255 @@ -208,6 +253,7 @@ /* x_c = min(x_c + y_c, 255) */ +#ifndef UN8x4_ADD_UN8x4 #define UN8x4_ADD_UN8x4(x, y) \ do \ { \ @@ -223,3 +269,4 @@ \ x = r1__ | (r2__ << G_SHIFT); \ } while (0) +#endif |