nouveau: codegen: LOAD: Always use component 0 when getting the address

LOAD loads upto 4 components from the specified resource starting at
the passed in x value of the 2nd source operand, the y, z and w
components of the address should not be used.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
index 1376a1a0f09..cdf9d9413e6 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
@@ -2383,7 +2383,8 @@ Converter::handleLOAD(Value *dst0[4])
          if (!dst0[c])
             continue;
 
-         Value *off = fetchSrc(1, c);
+         // yzw are ignored for buffers
+         Value *off = fetchSrc(1, 0);
          Symbol *sym;
          if (tgsi.getSrc(1).getFile() == TGSI_FILE_IMMEDIATE) {
             off = NULL;
@@ -2522,6 +2523,7 @@ Converter::handleSTORE()
             sym = makeSym(tgsi.getDst(0).getFile(), r, -1, c,
                           tgsi.getSrc(0).getValueU32(0, info) + 4 * c);
          } else {
+            // yzw are ignored for buffers
             off = fetchSrc(0, 0);
             sym = makeSym(tgsi.getDst(0).getFile(), r, -1, c, 4 * c);
          }