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i965/vs: Allow copy propagation into MUL/MACH.

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This is a trivial port of 1d6ead3804 from
the FS.

No significant performance difference on trex (misplaced the data, but it
was about n=20).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Eric Anholt
2013-06-07 17:58:18 -07:00
parent 263a7e4cd9
commit d28e285d41
1 changed files with 4 additions and 2 deletions
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6
src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
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@@ -95,6 +95,7 @@ try_constant_propagation(vec4_instruction *inst, int arg, src_reg *values[4])
inst->src[arg] = value;
return true;
case BRW_OPCODE_MACH:
case BRW_OPCODE_MUL:
case BRW_OPCODE_ADD:
if (arg == 1) {
@@ -102,9 +103,10 @@ try_constant_propagation(vec4_instruction *inst, int arg, src_reg *values[4])
return true;
} else if (arg == 0 && inst->src[1].file != IMM) {
/* Fit this constant in by commuting the operands. Exception: we
* can't do this for 32-bit integer MUL because it's asymmetric.
* can't do this for 32-bit integer MUL/MACH because it's asymmetric.
*/
if (inst->opcode == BRW_OPCODE_MUL &&
if ((inst->opcode == BRW_OPCODE_MUL ||
inst->opcode == BRW_OPCODE_MACH) &&
(inst->src[1].type == BRW_REGISTER_TYPE_D ||
inst->src[1].type == BRW_REGISTER_TYPE_UD))
break;