commit 0d0fc3f4658937fb81fcc16a89738e83bd8d4795
author Richard Henderson <richard.henderson@linaro.org> Sat Jun 28 09:57:53 2025 -0600
committer Richard Henderson <richard.henderson@linaro.org> Mon Jun 30 07:42:56 2025 -0600
tree 36e59b58b5202dd18e3972e5c3259695d105e895
parent 169d253e1f25cc4adff6571e249222e422a4b07e

tcg: Fix constant propagation in tcg_reg_alloc_dup

The scalar constant must be replicated for dup.

Cc: qemu-stable@nongnu.org
Fixes: bab1671f0fa ("tcg: Manually expand INDEX_op_dup_vec")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3002
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/tcg.c

diff --git a/tcg/tcg.c b/tcg/tcg.c
index d714ae2..50d40b9 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -5154,7 +5154,7 @@
 
     if (its->val_type == TEMP_VAL_CONST) {
         /* Propagate constant via movi -> dupi.  */
-        tcg_target_ulong val = its->val;
+        tcg_target_ulong val = dup_const(vece, its->val);
         if (IS_DEAD_ARG(1)) {
             temp_dead(s, its);
         }