Mesa (master): glsl: Add constant evaluation of ir_binop_bfm.
Matt Turner
mattst88 at kemper.freedesktop.org
Tue Jan 28 05:18:50 UTC 2014
Module: Mesa
Branch: master
Commit: 3ea64f9093fa1a37abf31db1360e0a66a5e50d98
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=3ea64f9093fa1a37abf31db1360e0a66a5e50d98
Author: Matt Turner <mattst88 at gmail.com>
Date: Thu Jan 23 15:39:43 2014 -0800
glsl: Add constant evaluation of ir_binop_bfm.
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
---
src/glsl/ir_constant_expression.cpp | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index f811fd1..7fa5a09 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -1397,6 +1397,23 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
break;
}
+ case ir_binop_bfm: {
+ int bits = op[0]->value.i[0];
+ int offset = op[1]->value.i[0];
+
+ for (unsigned c = 0; c < components; c++) {
+ if (bits == 0)
+ data.u[c] = op[0]->value.u[c];
+ else if (offset < 0 || bits < 0)
+ data.u[c] = 0; /* Undefined for bitfieldInsert, per spec. */
+ else if (offset + bits > 32)
+ data.u[c] = 0; /* Undefined for bitfieldInsert, per spec. */
+ else
+ data.u[c] = ((1 << bits) - 1) << offset;
+ }
+ break;
+ }
+
case ir_binop_ldexp:
for (unsigned c = 0; c < components; c++) {
data.f[c] = ldexp(op[0]->value.f[c], op[1]->value.i[c]);
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