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i965: Fix compute_to_mrf to not move a MRF write up into another live range. 

Fixes glsl-fs-copy-propagation-texcoords-1.
This commit is contained in:
Eric Anholt 2010-11-19 13:53:28 +08:00
parent 6b1d7dd781
commit 61126278a3
1 changed files with 5 additions and 7 deletions
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12
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -2975,15 +2975,13 @@ fs_visitor::compute_to_mrf()
}
if (scan_inst->mlen > 0) {
/* Found a SEND instruction, which will do some amount of
* implied write that may overwrite our MRF that we were
* hoping to compute-to-MRF somewhere above it. Nothing
* we have implied-writes more than 2 MRFs from base_mrf,
* though.
/* Found a SEND instruction, which means that there are
* live values in MRFs from base_mrf to base_mrf +
* scan_inst->mlen - 1. Don't go pushing our MRF write up
* above it.
*/
int implied_write_len = MIN2(scan_inst->mlen, 2);
if (inst->dst.hw_reg >= scan_inst->base_mrf &&
inst->dst.hw_reg < scan_inst->base_mrf + implied_write_len) {
inst->dst.hw_reg < scan_inst->base_mrf + scan_inst->mlen) {
break;
}
}