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authorMatt Turner <[email protected]>2013-09-17 18:02:05 -0700
committerMatt Turner <[email protected]>2013-10-07 10:41:16 -0700
commit6f9428eb68bb0f7592f4384455fc7aab23940d92 (patch)
tree4c84da7111570d6bd02b07122bda7414d8273d36 /bin
parent6c125973f31addf903921647e8244abccb944e1a (diff)
glsl: Implement usubBorrow() built-in for ARB_gpu_shader5.
i965 implements this with a single (multiple destination) instruction, SUBB. Emitting SUBB directly from usubBorrow() would be ideal, but our optimization passes don't know how to copy with expressions with side-effects. Radeon has an SUBB_UINT instruction that only generates the borrow bit. I've chosen to go this route and implement usubBorrow() by doing the subtraction and the borrow operations separately. Reviewed-by: Kenneth Graunke <[email protected]> Reviewed-by: Ian Romanick <[email protected]>
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