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authorBrian Paul <[email protected]>2009-08-20 10:28:22 -0600
committerBrian Paul <[email protected]>2009-08-20 10:28:22 -0600
commit4c7c294ffff2a66f4585faa41ea9810527ea1e92 (patch)
tree2c7ff318e6fcdaa79df8a1cef830e246e8913a22 /src/gallium/auxiliary/tgsi/tgsi_sse2.c
parent5e6d21afa4efe033e27b980cc26266c3db6d9021 (diff)
tgsi: handle SOA dependencies for MOV/SWZ
SOA dependencies can happen when a register is used both as a source and destination and the source is swizzled. For example: MOV T, T.yxwz; would expand into: MOV t0, t1; MOV t1, t0; MOV t2, t3; MOV t3, t2; The second instruction will produce the wrong result since we wrote to t0 in the first instruction. We need to use an intermediate temporary to fix this. This will take more work to fix for all TGSI instructions. This seems to happen with MOV instructions more than anything else so fix that case now and warn on others. Fixes piglit glsl-vs-loop test (when not using SSE). See bug 23317.
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi_sse2.c')
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