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i965/vec4: Constant propagate into 2-src math instructions on Gen8.

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit 7192207de1)
This commit is contained in:
Matt Turner 2014-06-23 22:07:38 -07:00 • committed by Carl Worth
parent 7fcfdfb17b
commit d389a863f2
1 changed files with 9 additions and 2 deletions
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11
src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
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@ -73,7 +73,8 @@ is_channel_updated(vec4_instruction *inst, src_reg *values[4], int ch)
}
static bool
try_constant_propagation(vec4_instruction *inst, int arg, src_reg *values[4])
try_constant_propagation(struct brw_context *brw, vec4_instruction *inst,
int arg, src_reg *values[4])
{
/* For constant propagation, we only handle the same constant
* across all 4 channels. Some day, we should handle the 8-bit
@ -110,6 +111,12 @@ try_constant_propagation(vec4_instruction *inst, int arg, src_reg *values[4])
inst->src[arg] = value;
return true;
case SHADER_OPCODE_POW:
case SHADER_OPCODE_INT_QUOTIENT:
case SHADER_OPCODE_INT_REMAINDER:
if (brw->gen < 8)
break;
/* fallthrough */
case BRW_OPCODE_DP2:
case BRW_OPCODE_DP3:
case BRW_OPCODE_DP4:
@ -357,7 +364,7 @@ vec4_visitor::opt_copy_propagation()
if (c != 4)
continue;
if (try_constant_propagation(inst, i, values) ||
if (try_constant_propagation(brw, inst, i, values) ||
try_copy_propagation(inst, i, values))
progress = true;
}