glsl: handle partial swizzles in opt_dead_code_local correctly
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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@ -106,9 +106,12 @@ public:
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int used = 0;
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used |= 1 << ir->mask.x;
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used |= 1 << ir->mask.y;
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used |= 1 << ir->mask.z;
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used |= 1 << ir->mask.w;
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if (ir->mask.num_components > 1)
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used |= 1 << ir->mask.y;
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if (ir->mask.num_components > 2)
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used |= 1 << ir->mask.z;
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if (ir->mask.num_components > 3)
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used |= 1 << ir->mask.w;
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use_channels(deref->var, used);
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