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i965/fs: Compare full register offsets in cmod propagation pass.

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This could potentially have misoptimized a program in cases where
inst->src[0] had a non-zero sub-GRF offset.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
This commit is contained in:
Francisco Jerez 2016-09-01 21:16:14 -07:00
parent 3a4ea7cf80
commit 9ae77d7020
1 changed files with 1 additions and 2 deletions
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3
src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
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@ -90,8 +90,7 @@ opt_cmod_propagation_local(const gen_device_info *devinfo, bblock_t *block)
foreach_inst_in_block_reverse_starting_from(fs_inst, scan_inst, inst) {
if (scan_inst->overwrites_reg(inst->src[0])) {
if (scan_inst->is_partial_write() ||
scan_inst->dst.offset / REG_SIZE !=
inst->src[0].offset / REG_SIZE ||
scan_inst->dst.offset != inst->src[0].offset ||
scan_inst->exec_size != inst->exec_size)
break;