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panfrost/midgard: Fix swizzle for store instructions

Boris Brezillon requested to merge bbrezillon/mesa:panfrost-midgard-fix-store-swizzle into master

The current logic considers that the nir_intrinsic_component(store_intr) encodes the source components start, but it actually encodes the destination one. Source component offset adjustment is taken care of in install_registers_instr(), when offset_swizzle() is called.

This fixes dEQP-GLES2.functional.shaders.random.all_features.fragment.45 when PAN_MESA_DEBUG=deqp (looks like exposing GLES3 features has an impact on the varyings layout).

Signed-off-by: Boris Brezillon boris.brezillon@collabora.com /cc @alyssa @tomeu

Edited by Alyssa Rosenzweig

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