From: Richard Henderson <richard.henderson@linaro.org>
Date: Sat, 28 Jun 2025 15:57:53 +0000 (-0600)
Subject: tcg: Fix constant propagation in tcg_reg_alloc_dup
X-Git-Tag: v10.1.0-rc0~39^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d0fc3f4658937fb81fcc16a89738e83bd8d4795;p=thirdparty%2Fqemu.git

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>
---

diff --git a/tcg/tcg.c b/tcg/tcg.c
index d714ae2889c..50d40b9cbec 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -5154,7 +5154,7 @@ static void tcg_reg_alloc_dup(TCGContext *s, const TCGOp *op)
 
     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);
         }