V2: Put in alphabetic order
Rework to use new IS_CONSTANT macro
Reduce code duplication by combining pos only and neg only variation
---
src/glsl/opt_minmax.cpp | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/src/glsl/opt_minmax.cpp b/src/glsl/opt_minmax.cpp
index 0901c95..0bfa340 100644
--- a/src/glsl/opt_minmax.cpp
+++ b/src/glsl/opt_minmax.cpp
@@ -410,6 +410,35 @@ get_range(ir_rvalue *rval)
return minmax_range(low, high);
+ case ir_unop_rcp:
+ r0 = get_range(expr->operands[0]);
+
+ // If operand is guaranteed positive only or negative only
+ // then high = 1/low and low = 1/high
+ if (IS_CONSTANT(r0.low, >, 0.0f) ||
+ (IS_CONSTANT(r0.low, <, 0.0f) && IS_CONSTANT(r0.high, <, 0.0f))) {
+ ir_expression *h = new(mem_ctx) ir_expression(ir_unop_rcp, r0.low);
+ high = h->constant_expression_value();
+ if (r0.high) {
+ ir_expression *l =
+ new(mem_ctx) ir_expression(ir_unop_rcp, r0.high);
+ low = l->constant_expression_value();
+ }
+ }
+
+ // If low range is negative and high range is positive
+ // then low = 1/low and high = 1/high
+ if (IS_CONSTANT(r0.low, <, 0.0f) && IS_CONSTANT(r0.high, >, 0.0f)) {
+ ir_expression *h =
+ new(mem_ctx) ir_expression(ir_unop_rcp, r0.high);
+ high = h->constant_expression_value();
+ ir_expression *l =
+ new(mem_ctx) ir_expression(ir_unop_rcp, r0.low);
+ low = l->constant_expression_value();
+ }
+
+ return minmax_range(low, high);
+
case ir_unop_saturate:
r0 = minmax_range(new(mem_ctx) ir_constant(0.0f),
new(mem_ctx) ir_constant(1.0f));
--
2.2.1
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