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i965: Implement work-around for CMP with null dest on Haswell.

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2013-04-15 14:59:09 -07:00
parent 1a59cc777f
commit 60e4c99488
1 changed files with 12 additions and 0 deletions
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12
src/mesa/drivers/dri/i965/brw_eu_emit.c
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@ -1653,6 +1653,7 @@ void brw_CMP(struct brw_compile *p,
struct brw_reg src0,
struct brw_reg src1)
{
struct intel_context *intel = &p->brw->intel;
struct brw_instruction *insn = next_insn(p, BRW_OPCODE_CMP);
insn->header.destreg__conditionalmod = conditional;
@ -1672,6 +1673,17 @@ void brw_CMP(struct brw_compile *p,
p->current->header.predicate_control = BRW_PREDICATE_NORMAL;
p->flag_value = 0xff;
}
/* Item WaCMPInstNullDstForcesThreadSwitch in the Haswell Bspec workarounds
* page says:
* "Any CMP instruction with a null destination must use a {switch}."
*/
if (intel->is_haswell) {
if (dest.file == BRW_ARCHITECTURE_REGISTER_FILE &&
dest.nr == BRW_ARF_NULL) {
insn->header.thread_control = BRW_THREAD_SWITCH;
}
}
}
/* Issue 'wait' instruction for n1, host could program MMIO