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-rw-r--r--src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp10
1 files changed, 9 insertions, 1 deletions
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
index cb822168d16..71013eb63b5 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
@@ -2183,7 +2183,15 @@ NVC0LoweringPass::handleLDST(Instruction *i)
int8_t fileIndex = i->getSrc(0)->reg.fileIndex - 1;
Value *ind = i->getIndirect(0, 1);
- // TODO: clamp the offset to the maximum number of const buf.
+ if (ind) {
+ // Clamp the UBO index when an indirect access is used to avoid
+ // loading information from the wrong place in the driver cb.
+ ind = bld.mkOp2v(OP_MIN, TYPE_U32, ind,
+ bld.mkOp2v(OP_ADD, TYPE_U32, bld.getSSA(),
+ ind, bld.loadImm(NULL, fileIndex)),
+ bld.loadImm(NULL, 12));
+ }
+
if (i->src(0).isIndirect(1)) {
Value *offset = bld.loadImm(NULL, i->getSrc(0)->reg.data.offset + typeSizeof(i->sType));
Value *ptr = loadUboInfo64(ind, fileIndex * 16);