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nir/builder: only read meaningful channels in nir_swizzle()

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This way the caller doesn't have to initialize all 4 channels when they
aren't using them.

v2: Fix signed/unsigned comparison warning (Iago)

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Connor Abbott
2015-08-03 15:04:13 -07:00
committed by Iago Toral Quiroga
parent d982922b18
commit fb93dd7aa8
1 changed files with 1 additions and 1 deletions
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src/glsl/nir/nir_builder.h
+1 -1
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@@ -242,7 +242,7 @@ nir_swizzle(nir_builder *build, nir_ssa_def *src, unsigned swiz[4],
{
nir_alu_src alu_src = { NIR_SRC_INIT };
alu_src.src = nir_src_for_ssa(src);
for (int i = 0; i < 4; i++)
for (unsigned i = 0; i < num_components; i++)
alu_src.swizzle[i] = swiz[i];
return use_fmov ? nir_fmov_alu(build, alu_src, num_components) :