diff options
| author | Ian Romanick <idr@us.ibm.com> | 2004-10-18 23:24:51 +0000 |
|---|---|---|
| committer | Ian Romanick <idr@us.ibm.com> | 2004-10-18 23:24:51 +0000 |
| commit | f404ff7b76d70a495d4246851127125a194a1adf (patch) | |
| tree | 93394d40594b50ab64165e41bcb968ce3b53de1d /src/mesa/drivers/dri/common/spantmp2.h | |
| parent | f459b9f9c0ac4f0634028a7edb6275bb1201a055 (diff) | |
Small optimization for big-endian (e.g., PowerPC) systems.
Diffstat (limited to 'src/mesa/drivers/dri/common/spantmp2.h')
| -rw-r--r-- | src/mesa/drivers/dri/common/spantmp2.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/common/spantmp2.h b/src/mesa/drivers/dri/common/spantmp2.h index 6bdbe150c3..5a161b11dd 100644 --- a/src/mesa/drivers/dri/common/spantmp2.h +++ b/src/mesa/drivers/dri/common/spantmp2.h @@ -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 { \ |