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i965/fs: Teach compute_to_mrf() about the COMPR4 address transformation.

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This will be required to correctly transform the destination of 8-wide
instructions that write a single GRF of a VGRF to MRF copy marked
COMPR4.

Cc: "12.0" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Francisco Jerez 2016-05-27 14:17:28 -07:00
parent 485fbaff03
commit 1898673f58
1 changed files with 23 additions and 1 deletions
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24
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -2894,8 +2894,30 @@ fs_visitor::compute_to_mrf()
foreach_inst_in_block_reverse_starting_from(fs_inst, scan_inst, inst) {
if (regions_overlap(scan_inst->dst, scan_inst->regs_written * REG_SIZE,
inst->src[0], inst->regs_read(0) * REG_SIZE)) {
const unsigned rel_offset = (reg_offset(scan_inst->dst) -
reg_offset(inst->src[0])) / REG_SIZE;
if (inst->dst.nr & BRW_MRF_COMPR4) {
/* Apply the same address transformation done by the hardware
* for COMPR4 MRF writes.
*/
assert(rel_offset < 2);
scan_inst->dst.nr = inst->dst.nr + rel_offset * 4;
/* Clear the COMPR4 bit if the generating instruction is not
* compressed.
*/
if (scan_inst->regs_written < 2)
scan_inst->dst.nr &= ~BRW_MRF_COMPR4;
} else {
/* Calculate the MRF number the result of this instruction is
* ultimately written to.
*/
scan_inst->dst.nr = inst->dst.nr + rel_offset;
}
scan_inst->dst.file = MRF;
scan_inst->dst.nr = inst->dst.nr;
scan_inst->dst.reg_offset = 0;
scan_inst->saturate |= inst->saturate;
break;