The spec states that pow is undefined for x < 0.
Just set the range to correspond to a constant 0
if this is the case.
---
src/glsl/opt_minmax.cpp | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/src/glsl/opt_minmax.cpp b/src/glsl/opt_minmax.cpp
index 9852dd9..ad8c88a 100644
--- a/src/glsl/opt_minmax.cpp
+++ b/src/glsl/opt_minmax.cpp
@@ -335,6 +335,17 @@ get_range(ir_rvalue *rval)
high = add(r0.high, r1.high)->constant_expression_value();
return minmax_range(low, high);
+ case ir_binop_pow:
+ r0 = get_range(expr->operands[0]);
+ if (is_greater_than_or_equal_zero(r0.low))
+ low = new(mem_ctx) ir_constant(0.0f);
+ // Result is undefined so we can set the range to bikeshed.
+ if (is_less_than_zero(r0.high)) {
+ low = new(mem_ctx) ir_constant(0.0f);
+ high = new(mem_ctx) ir_constant(0.0f);
+ }
+ return minmax_range(low, high);
+
default:
break;
}
--
2.0.3
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