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i965/vec4: Emit MADs from (x + abs(y * z)). 

Same as commit 3654b6d4 to the fs backend.

total instructions in shared programs: 5945788 -> 5945787 (-0.00%)
instructions in affected programs:     36 -> 35 (-2.78%)
helped:                                1

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2015-01-30 18:24:20 -08:00
parent 3d581f9996
commit fff0b2eab5
1 changed files with 15 additions and 3 deletions
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18
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
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@ -1161,8 +1161,11 @@ vec4_visitor::try_emit_mad(ir_expression *ir)
ir_rvalue *nonmul = ir->operands[1];
ir_expression *mul = ir->operands[0]->as_expression();
bool mul_negate = false;
if (mul && mul->operation == ir_unop_neg) {
bool mul_negate = false, mul_abs = false;
if (mul && mul->operation == ir_unop_abs) {
mul = mul->operands[0]->as_expression();
mul_abs = true;
} else if (mul && mul->operation == ir_unop_neg) {
mul = mul->operands[0]->as_expression();
mul_negate = true;
}
@ -1171,7 +1174,10 @@ vec4_visitor::try_emit_mad(ir_expression *ir)
nonmul = ir->operands[0];
mul = ir->operands[1]->as_expression();
if (mul && mul->operation == ir_unop_neg) {
if (mul && mul->operation == ir_unop_abs) {
mul = mul->operands[0]->as_expression();
mul_abs = true;
} else if (mul && mul->operation == ir_unop_neg) {
mul = mul->operands[0]->as_expression();
mul_negate = true;
}
@ -1186,9 +1192,15 @@ vec4_visitor::try_emit_mad(ir_expression *ir)
mul->operands[0]->accept(this);
src_reg src1 = fix_3src_operand(this->result);
src1.negate ^= mul_negate;
src1.abs = mul_abs;
if (mul_abs)
src1.negate = false;
mul->operands[1]->accept(this);
src_reg src2 = fix_3src_operand(this->result);
src2.abs = mul_abs;
if (mul_abs)
src2.negate = false;
this->result = src_reg(this, ir->type);
emit(BRW_OPCODE_MAD, dst_reg(this->result), src0, src1, src2);