tcg: Fix constant propagation in tcg_reg_alloc_dup

rth7680 · Michael Tokarev · commit 22909a1397ad · 2025-07-01T22:02:27.000+03:00
The scalar constant must be replicated for dup. Cc: qemu-stable@nongnu.org Fixes: bab1671 ("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> (cherry picked from commit 0d0fc3f4658937fb81fcc16a89738e83bd8d4795) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/tcg/tcg.c b/tcg/tcg.c
@@ -4927,7 +4927,7 @@ 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);
         }

Original file line number	Diff line number	Diff line change
`@@ -4927,7 +4927,7 @@ static void tcg_reg_alloc_dup(TCGContext s, const TCGOp op)`
`4927`	`4927`
`4928`	`4928`	`if (its->val_type == TEMP_VAL_CONST) {`
`4929`	`4929`	`/* Propagate constant via movi -> dupi. */`
`4930`		`- tcg_target_ulong val = its->val;`
	`4930`	`+ tcg_target_ulong val = dup_const(vece, its->val);`
`4931`	`4931`	`if (IS_DEAD_ARG(1)) {`
`4932`	`4932`	`temp_dead(s, its);`
`4933`	`4933`	`}`