Mesa (master): ac/llvm: load 1 byte at a time if unaligned on gfx10

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Module: Mesa
Branch: master
Commit: 993c64e6fe70d458ad76b86232aabb4196d3a9a9
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=993c64e6fe70d458ad76b86232aabb4196d3a9a9

Author: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer at amd.com>
Date:   Tue Jun 16 14:46:08 2020 +0200

ac/llvm: load 1 byte at a time if unaligned on gfx10

If buffer or stride is unaligned we use the same trick as on gfx6:
load 1 byte at a time and recompose the output if needed.
This change fixes lots of deqp/glcts tests:
  - dEQP-GLES2.functional.draw.random.1, 10, ...
  - dEQP-GLES2.functional.vertex_arrays.multiple_attributes.stride.3_float2_0_float2_0_float2_17, ...
  - dEQP-GLES2.functional.vertex_arrays.single_attribute.first.byte_first24_offset1_stride2_quads256, ...
  - dEQP-GLES2.functional.vertex_arrays.single_attribute.strides.buffer_0_17_byte2_vec4_dynamic_draw_quads_1, ...
  - dEQP-GLES31.functional.draw_indirect.random.14, ...

Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5502>

---

 src/amd/llvm/ac_llvm_build.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/amd/llvm/ac_llvm_build.c b/src/amd/llvm/ac_llvm_build.c
index 69b1deaa8b2..77681834ffa 100644
--- a/src/amd/llvm/ac_llvm_build.c
+++ b/src/amd/llvm/ac_llvm_build.c
@@ -1651,7 +1651,7 @@ ac_build_opencoded_load_format(struct ac_llvm_context *ctx,
 	}
 
 	int log_recombine = 0;
-	if (ctx->chip_class == GFX6 && !known_aligned) {
+	if ((ctx->chip_class == GFX6 || ctx->chip_class == GFX10) && !known_aligned) {
 		/* Avoid alignment restrictions by loading one byte at a time. */
 		load_num_channels <<= load_log_size;
 		log_recombine = load_log_size;