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i965/fs: Fix a bug with dead_code_eliminate on large writes

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Previously, if an instruction wrote to more than one register, we
implicitly assumed that it filled the entire register.  We never hit this
before because the only time we did multi-register writes was things like
texturing which always wrote to all of the registers.  However, with the
upcoming ability to do 16-wide instructions in SIMD8 and things of that
nature, we can have multi-register writes at offsets and we'll hit this.

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2014-09-24 13:16:43 -07:00
parent 1385a4b706
commit c24dd54f97
1 changed files with 1 additions and 1 deletions
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2
src/mesa/drivers/dri/i965/brw_fs_dead_code_eliminate.cpp
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@ -58,7 +58,7 @@ fs_visitor::dead_code_eliminate()
int var = live_intervals->var_from_reg(&inst->dst);
result_live = BITSET_TEST(live, var);
} else {
int var = live_intervals->var_from_vgrf[inst->dst.reg];
int var = live_intervals->var_from_reg(&inst->dst);
for (int i = 0; i < inst->regs_written; i++) {
result_live = result_live || BITSET_TEST(live, var + i);
}