Mesa (master): nouveau: codegen: LOAD: Always use component 0 when getting the address

[Hans de Goede]

Module: Mesa
Branch: master
Commit: 1958397a587919e4a3ec83441c3717813ba2f18b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1958397a587919e4a3ec83441c3717813ba2f18b

Author: Hans de Goede <hdegoede at redhat.com>
Date:   Thu Apr 21 13:31:01 2016 +0200

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 at redhat.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Ilia Mirkin <imirkin at alum.mit.edu>

---

 src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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 1376a1a..cdf9d94 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);
          }