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Small optimization for big-endian (e.g., PowerPC) systems.

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This commit is contained in:
Ian Romanick
2004-10-18 23:24:51 +00:00
parent f459b9f9c0
commit f404ff7b76
1 changed files with 10 additions and 0 deletions
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10
src/mesa/drivers/dri/common/spantmp2.h
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@@ -115,6 +115,16 @@
: "=r" (p) : "r" (p) ); \
((GLuint *)rgba)[0] = p; \
} while (0)
# elif defined( MESA_BIG_ENDIAN )
/* On PowerPC with GCC 3.4.2 the shift madness below becomes a single
* rotlwi instruction. It also produces good code on SPARC.
*/
# define READ_RGBA( rgba, _x, _y ) \
do { \
GLuint p = *(volatile GLuint *) GET_SRC_PTR(_x, _y); \
GLuint t = p; \
*((uint32_t *) rgba) = (t >> 24) | (p << 8); \
} while (0)
# else
# define READ_RGBA( rgba, _x, _y ) \
do { \