[PULL 4/4] target/rx: Fix compiler errors for build with sanitizers

[Laurent Vivier <laurent@vivier.eu>]

From: Stefan Weil <sw@weilnetz.de>

gcc (Debian 10.2.1-6) 10.2.1 20210110 aborts builds with enabled sanitizers:

../../../target/rx/op_helper.c: In function ‘helper_scmpu’:
../../../target/rx/op_helper.c:213:24: error: ‘tmp1’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  213 |     env->psw_c = (tmp0 >= tmp1);
      |                  ~~~~~~^~~~~~~~
../../../target/rx/op_helper.c:213:24: error: ‘tmp0’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
../../../target/rx/op_helper.c: In function ‘helper_suntil’:
../../../target/rx/op_helper.c:299:23: error: ‘tmp’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  299 |     env->psw_c = (tmp <= env->regs[2]);
      |                  ~~~~~^~~~~~~~~~~~~~~~
../../../target/rx/op_helper.c: In function ‘helper_swhile’:
../../../target/rx/op_helper.c:318:23: error: ‘tmp’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  318 |     env->psw_c = (tmp <= env->regs[2]);
      |                  ~~~~~^~~~~~~~~~~~~~~~

Rewriting the code fixes those errors.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210128172127.46041-1-sw@weilnetz.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 target/rx/op_helper.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/target/rx/op_helper.c b/target/rx/op_helper.c
index 59389f49921f..4d315b44492f 100644
--- a/target/rx/op_helper.c
+++ b/target/rx/op_helper.c
@@ -201,14 +201,14 @@ void helper_scmpu(CPURXState *env)
     if (env->regs[3] == 0) {
         return;
     }
-    while (env->regs[3] != 0) {
+    do {
         tmp0 = cpu_ldub_data_ra(env, env->regs[1]++, GETPC());
         tmp1 = cpu_ldub_data_ra(env, env->regs[2]++, GETPC());
         env->regs[3]--;
         if (tmp0 != tmp1 || tmp0 == '\0') {
             break;
         }
-    }
+    } while (env->regs[3] != 0);
     env->psw_z = tmp0 - tmp1;
     env->psw_c = (tmp0 >= tmp1);
 }
@@ -287,14 +287,14 @@ void helper_suntil(CPURXState *env, uint32_t sz)
     if (env->regs[3] == 0) {
         return ;
     }
-    while (env->regs[3] != 0) {
+    do {
         tmp = cpu_ldufn[sz](env, env->regs[1], GETPC());
         env->regs[1] += 1 << sz;
         env->regs[3]--;
         if (tmp == env->regs[2]) {
             break;
         }
-    }
+    } while (env->regs[3] != 0);
     env->psw_z = tmp - env->regs[2];
     env->psw_c = (tmp <= env->regs[2]);
 }
@@ -306,14 +306,14 @@ void helper_swhile(CPURXState *env, uint32_t sz)
     if (env->regs[3] == 0) {
         return ;
     }
-    while (env->regs[3] != 0) {
+    do {
         tmp = cpu_ldufn[sz](env, env->regs[1], GETPC());
         env->regs[1] += 1 << sz;
         env->regs[3]--;
         if (tmp != env->regs[2]) {
             break;
         }
-    }
+    } while (env->regs[3] != 0);
     env->psw_z = env->regs[3];
     env->psw_c = (tmp <= env->regs[2]);
 }
-- 
2.29.2