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-rw-r--r--src/compiler/nir/nir_opt_algebraic.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index e8696abaf52..f275d70d276 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -394,6 +394,12 @@ optimizations = [
(('ior', ('uge', 1, a), ('ieq', a, 2)), ('uge', 2, a)),
(('ior', ('uge', 2, a), ('ieq', a, 3)), ('uge', 3, a)),
+ # The (i2f32, ...) part is an open-coded fsign. When that is combined with
+ # the bcsel, it's basically copysign(1.0, a). There is no copysign in NIR,
+ # so emit an open-coded version of that.
+ (('bcsel@32', ('feq', a, 0.0), 1.0, ('i2f32', ('iadd', ('b2i32', ('flt', 0.0, 'a@32')), ('ineg', ('b2i32', ('flt', 'a@32', 0.0)))))),
+ ('ior', 0x3f800000, ('iand', a, 0x80000000))),
+
(('ior', a, ('ieq', a, False)), True),
(('ior', a, ('inot', a)), -1),