[Mesa-dev] [PATCH 05/19] nir: Remove series of unnecessary conversions

[Matt Turner]

Clang warns:

warning: absolute value function 'fabsf' given an argument of type
'const float64_t' (aka 'const double') but has parameter of type 'float'
which may cause truncation of value [-Wabsolute-value]

            float64_t dst = bit_size == 64 ? fabs(src0) : fabsf(src0);

The type of the ternary expression will be the common type of fabs() and
fabsf(): double. So fabsf(src0) will be implicitly converted to double.
We may as well just convert src0 to double before a call to fabs() and
remove the needless complexity, à la

            float64_t dst = fabs(src0);
---
 src/compiler/nir/nir_opcodes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py
index 39c01a702f..06ae820c3e 100644
--- a/src/compiler/nir/nir_opcodes.py
+++ b/src/compiler/nir/nir_opcodes.py
@@ -156,7 +156,7 @@ unop("fsign", tfloat, ("bit_size == 64 ? " +
                        "((src0 == 0.0f) ? 0.0f : ((src0 > 0.0f) ? 1.0f : -1.0f))"))
 unop("isign", tint, "(src0 == 0) ? 0 : ((src0 > 0) ? 1 : -1)")
 unop("iabs", tint, "(src0 < 0) ? -src0 : src0")
-unop("fabs", tfloat, "bit_size == 64 ? fabs(src0) : fabsf(src0)")
+unop("fabs", tfloat, "fabs(src0)")
 unop("fsat", tfloat, ("bit_size == 64 ? " +
                       "((src0 > 1.0) ? 1.0 : ((src0 <= 0.0) ? 0.0 : src0)) : " +
                       "((src0 > 1.0f) ? 1.0f : ((src0 <= 0.0f) ? 0.0f : src0))"))
-- 
2.13.5