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authorMatt Turner <[email protected]>2014-09-07 00:41:41 -0700
committerMatt Turner <[email protected]>2014-09-27 12:18:37 -0700
commit5ccdc23a86978628449ace0058cd3697020b0c94 (patch)
tree9ed677bba3e223e8ff6d7680bb6e5f10c05dae27 /src/glsl
parente9aee2572a56b24d69dd1e01c1a1db3608dd2bc9 (diff)
glsl: Recognize open-coded pow(x, y).
pow(x, y) is equivalent to exp(log(x) * y). instructions in affected programs: 578 -> 458 (-20.76%) Reviewed-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'src/glsl')
-rw-r--r--src/glsl/opt_algebraic.cpp14
1 files changed, 14 insertions, 0 deletions
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 447618f9ef9..0cdb8ecfc0a 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -357,6 +357,20 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
if (op_expr[0]->operation == ir_unop_log2) {
return op_expr[0]->operands[0];
}
+
+ if (!options->EmitNoPow && op_expr[0]->operation == ir_binop_mul) {
+ for (int log2_pos = 0; log2_pos < 2; log2_pos++) {
+ ir_expression *log2_expr =
+ op_expr[0]->operands[log2_pos]->as_expression();
+
+ if (log2_expr && log2_expr->operation == ir_unop_log2) {
+ return new(mem_ctx) ir_expression(ir_binop_pow,
+ ir->type,
+ log2_expr->operands[0],
+ op_expr[0]->operands[1 - log2_pos]);
+ }
+ }
+ }
break;
case ir_unop_log2: