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intel/compiler: grf127 can not be dest when src and dest overlap in send

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Implement at brw_eu_validate the restriction from Intel Broadwell PRM,
vol 07, section "Instruction Set Reference", subsection "EUISA
Instructions", Send Message (page 990):

"r127 must not be used for return address when there is a src and
dest overlap in send instruction."

v2: Style fixes (Matt Turner)

Reviewed-by: Matt Turner <mattst88@gmail.com>
Cc: 18.1 <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Jose Maria Casanova Crespo
2018-03-26 14:59:46 +02:00
parent 6f3aee40f9
commit 0e47ecb29a
1 changed files with 11 additions and 0 deletions
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11
src/intel/compiler/brw_eu_validate.c
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@@ -261,6 +261,17 @@ send_restrictions(const struct gen_device_info *devinfo,
brw_inst_src0_da_reg_nr(devinfo, inst) < 112,
"send with EOT must use g112-g127");
}
if (devinfo->gen >= 8) {
ERROR_IF(!dst_is_null(devinfo, inst) &&
(brw_inst_dst_da_reg_nr(devinfo, inst) +
brw_inst_rlen(devinfo, inst) > 127) &&
(brw_inst_src0_da_reg_nr(devinfo, inst) +
brw_inst_mlen(devinfo, inst) >
brw_inst_dst_da_reg_nr(devinfo, inst)),
"r127 must not be used for return address when there is "
"a src and dest overlap");
}
}
return error_msg;