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authorMatt Turner <mattst88@gmail.com>2014-10-17 20:32:58 -0700
committerMatt Turner <mattst88@gmail.com>2014-10-29 21:35:46 -0700
commitd056863b3c535aeebfe5fcfc9468eb33a06ddb60 (patch)
tree9718584e114426560451e5d0c075412775d83353 /src
parent26122e09a304061e46690e1b9da2e36a527b3e2e (diff)
glsl: Drop constant 0.0 components from dot products.
Helps a small number of vertex shaders in the games Dungeon Defenders and Shank, as well as an internal benchmark. instructions in affected programs: 2801 -> 2719 (-2.93%) Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Diffstat (limited to 'src')
-rw-r--r--src/glsl/opt_algebraic.cpp27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 0cdb8ecfc0a..c8d1ba1e2f5 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -553,6 +553,33 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
}
return new(mem_ctx) ir_swizzle(ir->operands[0], component, 0, 0, 0, 1);
}
+
+ for (int i = 0; i < 2; i++) {
+ if (!op_const[i])
+ continue;
+
+ unsigned components[4] = { 0 }, count = 0;
+
+ for (unsigned c = 0; c < op_const[i]->type->vector_elements; c++) {
+ if (op_const[i]->value.f[c] == 0.0)
+ continue;
+
+ components[count] = c;
+ count++;
+ }
+
+ /* No channels had zero values; bail. */
+ if (count >= op_const[i]->type->vector_elements)
+ break;
+
+ /* Swizzle both operands to remove the channels that were zero. */
+ return new(mem_ctx)
+ ir_expression(ir_binop_dot, glsl_type::float_type,
+ new(mem_ctx) ir_swizzle(ir->operands[0],
+ components, count),
+ new(mem_ctx) ir_swizzle(ir->operands[1],
+ components, count));
+ }
break;
case ir_binop_less: