From 615586cb356811e46c2e5f85c36db4b93f8381cd Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 17 Oct 2024 11:09:52 +0200
Subject: [PATCH] tcg/s390x: fix constraint for 32-bit TSTEQ/TSTNE
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

32-bit TSTEQ and TSTNE is subject to the same constraints as
for 64-bit, but setcond_i32 and negsetcond_i32 were incorrectly
using TCG_CT_CONST ("i") instead of TCG_CT_CONST_CMP ("C").

Adjust the constraint and make tcg_target_const_match use the
same sequence as tgen_cmp2: first check if the constant is a
valid operand for TSTEQ/TSTNE, then accept everything for 32-bit
non-test comparisons, finally check if the constant is a valid
operand for 64-bit non-test comparisons.

Reported-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Cc: qemu-stable@nongnu.org

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 tcg/s390x/tcg-target.c.inc | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/tcg/s390x/tcg-target.c.inc b/tcg/s390x/tcg-target.c.inc
index a5d57197a4..27bccc14e5 100644
--- a/tcg/s390x/tcg-target.c.inc
+++ b/tcg/s390x/tcg-target.c.inc
@@ -565,6 +565,20 @@ static bool tcg_target_const_match(int64_t val, int ct,
     }
 
     if (ct & TCG_CT_CONST_CMP) {
+        if (is_tst_cond(cond)) {
+            if (is_const_p16(uval) >= 0) {
+                return true;  /* TMxx */
+            }
+            if (risbg_mask(uval)) {
+                return true;  /* RISBG */
+            }
+            return false;
+        }
+
+        if (type == TCG_TYPE_I32) {
+            return true;
+        }
+
         switch (cond) {
         case TCG_COND_EQ:
         case TCG_COND_NE:
@@ -584,13 +598,7 @@ static bool tcg_target_const_match(int64_t val, int ct,
             break;
         case TCG_COND_TSTNE:
         case TCG_COND_TSTEQ:
-            if (is_const_p16(uval) >= 0) {
-                return true;  /* TMxx */
-            }
-            if (risbg_mask(uval)) {
-                return true;  /* RISBG */
-            }
-            break;
+            /* checked above, fallthru */
         default:
             g_assert_not_reached();
         }
@@ -3231,9 +3239,9 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
     case INDEX_op_rotl_i64:
     case INDEX_op_rotr_i32:
     case INDEX_op_rotr_i64:
+        return C_O1_I2(r, r, ri);
     case INDEX_op_setcond_i32:
     case INDEX_op_negsetcond_i32:
-        return C_O1_I2(r, r, ri);
     case INDEX_op_setcond_i64:
     case INDEX_op_negsetcond_i64:
         return C_O1_I2(r, r, rC);