nv50/ir: copy over value's register id when resolving merge of a phi

The offset needs to be properly copied over to the phi value, otherwise
it will get assigned to the base of the merge instead of the proper
location.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Samuel Pitoiset <[email protected]>
Cc: [email protected]

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp
index 7e64f7ce92c..d36c8531a27 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp
@@ -1905,8 +1905,10 @@ GCRA::resolveSplitsAndMerges()
          // their registers should be identical.
          if (v->getInsn()->op == OP_PHI || v->getInsn()->op == OP_UNION) {
             Instruction *phi = v->getInsn();
-            for (int phis = 0; phi->srcExists(phis); ++phis)
+            for (int phis = 0; phi->srcExists(phis); ++phis) {
                phi->getSrc(phis)->join = v;
+               phi->getSrc(phis)->reg.data.id = v->reg.data.id;
+            }
          }
          reg += v->reg.size;
       }