KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Just use the abs source modifier on both of the multiplicand
arguments.

instructions in affected programs:     300 -> 296 (-1.33%)

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
This commit is contained in:
Matt Turner 2015-01-13 13:35:15 -08:00
parent c4fab711ed
commit 3654b6d43c
1 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
View File

@ -431,8 +431,11 @@ fs_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;
}
@ -441,7 +444,10 @@ fs_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;
}
@ -461,9 +467,15 @@ fs_visitor::try_emit_mad(ir_expression *ir)
mul->operands[0]->accept(this);
fs_reg src1 = this->result;
src1.negate ^= mul_negate;
src1.abs = mul_abs;
if (mul_abs)
src1.negate = false;
mul->operands[1]->accept(this);
fs_reg src2 = this->result;
src2.abs = mul_abs;
if (mul_abs)
src2.negate = false;
this->result = fs_reg(this, ir->type);
emit(BRW_OPCODE_MAD, this->result, src0, src1, src2);