gallivm: allow to pass two swizzles into fetches.

This hijacks the top 16-bits of swizzle, to pass in the swizzle
for the second channel.

This fixes handling .yx swizzles of 64-bit values.

This should fixup radeonsi and llvmpipe.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107524
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi.c
index 64d2cd703be..2c3be8fb127 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi.c
@@ -353,6 +353,15 @@ lp_build_emit_fetch_src(
          assert(0 && "invalid swizzle in emit_fetch()");
          return bld_base->base.undef;
       }
+      if (tgsi_type_is_64bit(stype)) {
+        unsigned swizzle2;
+        swizzle2 = tgsi_util_get_full_src_register_swizzle(reg, chan_index + 1);
+        if (swizzle2 > 3) {
+           assert(0 && "invalid swizzle in emit_fetch()");
+           return bld_base->base.undef;
+        }
+        swizzle |= (swizzle2 << 16);
+      }
    }
 
    assert(reg->Register.Index <= bld_base->info->file_max[reg->Register.File]);