Mesa (master): microsoft/compiler: Propagate access when lowering SSBO loads

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Module: Mesa
Branch: master
Commit: aea6f8effc2e6c95c6ea40232748c1a1931c3756
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=aea6f8effc2e6c95c6ea40232748c1a1931c3756

Author: Jesse Natalie <jenatali at microsoft.com>
Date:   Tue Apr 13 09:05:52 2021 -0700

microsoft/compiler: Propagate access when lowering SSBO loads

We'll want to preserve whether the load is accessing a read-only
SSBO or not.

Reviewed-by: Enrico Galli <enrico.galli at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10149>

---

 src/microsoft/compiler/dxil_nir.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/microsoft/compiler/dxil_nir.c b/src/microsoft/compiler/dxil_nir.c
index 97ad6f1cf67..2e86eb05879 100644
--- a/src/microsoft/compiler/dxil_nir.c
+++ b/src/microsoft/compiler/dxil_nir.c
@@ -267,6 +267,7 @@ lower_load_ssbo(nir_builder *b, nir_intrinsic_instr *intr)
 
    nir_ssa_def *buffer = intr->src[0].ssa;
    nir_ssa_def *offset = nir_iand(b, intr->src[1].ssa, nir_imm_int(b, ~3));
+   enum gl_access_qualifier access = nir_intrinsic_access(intr);
    unsigned bit_size = nir_dest_bit_size(intr->dest);
    unsigned num_components = nir_dest_num_components(intr->dest);
    unsigned num_bits = num_components * bit_size;
@@ -289,7 +290,8 @@ lower_load_ssbo(nir_builder *b, nir_intrinsic_instr *intr)
          nir_load_ssbo(b, DIV_ROUND_UP(subload_num_bits, 32), 32,
                        buffer, nir_iadd(b, offset, nir_imm_int(b, i / 8)),
                        .align_mul = 4,
-                       .align_offset = 0);
+                       .align_offset = 0,
+                       .access = access);
 
       /* If we have 2 bytes or less to load we need to adjust the u32 value so
        * we can always extract the LSB.