ppc: Fix a warning in bcdcfz code and improve BCD_DIG_BYTE macro

This commit fixes a warning in the code "(i * 2) ? .. : ..", which
should be better as "i ? .. : ..", and improves the BCD_DIG_BYTE
macro by placing parentheses around its argument to avoid possible
expansion issues like: BCD_DIG_BYTE(i + j).

Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 81f134bc4bb02c627b5abd4515e770c0a71194f4..8cf4ee32c182e9fbe254daf2132f27dd766019c6 100644 (file)
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -2551,9 +2551,9 @@ void helper_vsubecuq(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, ppc_avr_t *c)
 #define NATIONAL_NEG    0x2D
 
 #if defined(HOST_WORDS_BIGENDIAN)
-#define BCD_DIG_BYTE(n) (15 - (n/2))
+#define BCD_DIG_BYTE(n) (15 - ((n) / 2))
 #else
-#define BCD_DIG_BYTE(n) (n/2)
+#define BCD_DIG_BYTE(n) ((n) / 2)
 #endif
 
 static int bcd_get_sgn(ppc_avr_t *bcd)
@@ -2876,7 +2876,7 @@ uint32_t helper_bcdcfz(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
     }
 
     for (i = 0; i < 16; i++) {
-        zone_digit = (i * 2) ? b->u8[BCD_DIG_BYTE(i * 2)] >> 4 : zone_lead;
+        zone_digit = i ? b->u8[BCD_DIG_BYTE(i * 2)] >> 4 : zone_lead;
         digit = b->u8[BCD_DIG_BYTE(i * 2)] & 0xF;
         if (unlikely(zone_digit != zone_lead || digit > 0x9)) {
             invalid = 1;