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i965/fs: Add algebraic optimizations for MAD.

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total instructions in shared programs: 5764176 -> 5763808 (-0.01%)
instructions in affected programs:     25121 -> 24753 (-1.46%)
helped:                                164
HURT:                                  2

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner
2014-11-09 17:27:52 -08:00
parent 8cfd1e2ac6
commit bb33a31c38
1 changed files with 43 additions and 0 deletions
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src/mesa/drivers/dri/i965/brw_fs.cpp
+43
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@@ -2343,6 +2343,14 @@ fs_visitor::opt_algebraic()
break;
}
if (inst->src[0].file == IMM) {
assert(inst->src[0].type == BRW_REGISTER_TYPE_F);
inst->opcode = BRW_OPCODE_MOV;
inst->src[0].fixed_hw_reg.dw1.f *= inst->src[1].fixed_hw_reg.dw1.f;
inst->src[1] = reg_undef;
progress = true;
break;
}
break;
case BRW_OPCODE_ADD:
if (inst->src[1].file != IMM)
@@ -2355,6 +2363,15 @@ fs_visitor::opt_algebraic()
progress = true;
break;
}
if (inst->src[0].file == IMM) {
assert(inst->src[0].type == BRW_REGISTER_TYPE_F);
inst->opcode = BRW_OPCODE_MOV;
inst->src[0].fixed_hw_reg.dw1.f += inst->src[1].fixed_hw_reg.dw1.f;
inst->src[1] = reg_undef;
progress = true;
break;
}
break;
case BRW_OPCODE_OR:
if (inst->src[0].equals(inst->src[1])) {
@@ -2429,6 +2446,32 @@ fs_visitor::opt_algebraic()
}
}
break;
case BRW_OPCODE_MAD:
if (inst->src[1].is_zero() || inst->src[2].is_zero()) {
inst->opcode = BRW_OPCODE_MOV;
inst->src[1] = reg_undef;
inst->src[2] = reg_undef;
progress = true;
} else if (inst->src[0].is_zero()) {
inst->opcode = BRW_OPCODE_MUL;
inst->src[0] = inst->src[2];
inst->src[2] = reg_undef;
} else if (inst->src[1].is_one()) {
inst->opcode = BRW_OPCODE_ADD;
inst->src[1] = inst->src[2];
inst->src[2] = reg_undef;
progress = true;
} else if (inst->src[2].is_one()) {
inst->opcode = BRW_OPCODE_ADD;
inst->src[2] = reg_undef;
progress = true;
} else if (inst->src[1].file == IMM && inst->src[2].file == IMM) {
inst->opcode = BRW_OPCODE_ADD;
inst->src[1].fixed_hw_reg.dw1.f *= inst->src[2].fixed_hw_reg.dw1.f;
inst->src[2] = reg_undef;
progress = true;
}
break;
case SHADER_OPCODE_RCP: {
fs_inst *prev = (fs_inst *)inst->prev;
if (prev->opcode == SHADER_OPCODE_SQRT) {