From: Richard Henderson <richard.henderson@linaro.org>
Date: Sat, 7 Nov 2020 02:51:27 +0000 (-0800)
Subject: accel/tcg: Use add/sub overflow routines in tcg-runtime-gvec.c
X-Git-Tag: v6.1.0-rc0~119^2~42
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7702a855195b81c6551d60991237c04316201dff;p=thirdparty%2Fqemu.git

accel/tcg: Use add/sub overflow routines in tcg-runtime-gvec.c

Obvious uses of the new functions.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/accel/tcg/tcg-runtime-gvec.c b/accel/tcg/tcg-runtime-gvec.c
index 521da4a8137..ac7d28c251e 100644
--- a/accel/tcg/tcg-runtime-gvec.c
+++ b/accel/tcg/tcg-runtime-gvec.c
@@ -1073,9 +1073,8 @@ void HELPER(gvec_ssadd32)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(int32_t)) {
         int32_t ai = *(int32_t *)(a + i);
         int32_t bi = *(int32_t *)(b + i);
-        int32_t di = ai + bi;
-        if (((di ^ ai) &~ (ai ^ bi)) < 0) {
-            /* Signed overflow.  */
+        int32_t di;
+        if (sadd32_overflow(ai, bi, &di)) {
             di = (di < 0 ? INT32_MAX : INT32_MIN);
         }
         *(int32_t *)(d + i) = di;
@@ -1091,9 +1090,8 @@ void HELPER(gvec_ssadd64)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(int64_t)) {
         int64_t ai = *(int64_t *)(a + i);
         int64_t bi = *(int64_t *)(b + i);
-        int64_t di = ai + bi;
-        if (((di ^ ai) &~ (ai ^ bi)) < 0) {
-            /* Signed overflow.  */
+        int64_t di;
+        if (sadd64_overflow(ai, bi, &di)) {
             di = (di < 0 ? INT64_MAX : INT64_MIN);
         }
         *(int64_t *)(d + i) = di;
@@ -1143,9 +1141,8 @@ void HELPER(gvec_sssub32)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(int32_t)) {
         int32_t ai = *(int32_t *)(a + i);
         int32_t bi = *(int32_t *)(b + i);
-        int32_t di = ai - bi;
-        if (((di ^ ai) & (ai ^ bi)) < 0) {
-            /* Signed overflow.  */
+        int32_t di;
+        if (ssub32_overflow(ai, bi, &di)) {
             di = (di < 0 ? INT32_MAX : INT32_MIN);
         }
         *(int32_t *)(d + i) = di;
@@ -1161,9 +1158,8 @@ void HELPER(gvec_sssub64)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(int64_t)) {
         int64_t ai = *(int64_t *)(a + i);
         int64_t bi = *(int64_t *)(b + i);
-        int64_t di = ai - bi;
-        if (((di ^ ai) & (ai ^ bi)) < 0) {
-            /* Signed overflow.  */
+        int64_t di;
+        if (ssub64_overflow(ai, bi, &di)) {
             di = (di < 0 ? INT64_MAX : INT64_MIN);
         }
         *(int64_t *)(d + i) = di;
@@ -1209,8 +1205,8 @@ void HELPER(gvec_usadd32)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(uint32_t)) {
         uint32_t ai = *(uint32_t *)(a + i);
         uint32_t bi = *(uint32_t *)(b + i);
-        uint32_t di = ai + bi;
-        if (di < ai) {
+        uint32_t di;
+        if (uadd32_overflow(ai, bi, &di)) {
             di = UINT32_MAX;
         }
         *(uint32_t *)(d + i) = di;
@@ -1226,8 +1222,8 @@ void HELPER(gvec_usadd64)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(uint64_t)) {
         uint64_t ai = *(uint64_t *)(a + i);
         uint64_t bi = *(uint64_t *)(b + i);
-        uint64_t di = ai + bi;
-        if (di < ai) {
+        uint64_t di;
+        if (uadd64_overflow(ai, bi, &di)) {
             di = UINT64_MAX;
         }
         *(uint64_t *)(d + i) = di;
@@ -1273,8 +1269,8 @@ void HELPER(gvec_ussub32)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(uint32_t)) {
         uint32_t ai = *(uint32_t *)(a + i);
         uint32_t bi = *(uint32_t *)(b + i);
-        uint32_t di = ai - bi;
-        if (ai < bi) {
+        uint32_t di;
+        if (usub32_overflow(ai, bi, &di)) {
             di = 0;
         }
         *(uint32_t *)(d + i) = di;
@@ -1290,8 +1286,8 @@ void HELPER(gvec_ussub64)(void *d, void *a, void *b, uint32_t desc)
     for (i = 0; i < oprsz; i += sizeof(uint64_t)) {
         uint64_t ai = *(uint64_t *)(a + i);
         uint64_t bi = *(uint64_t *)(b + i);
-        uint64_t di = ai - bi;
-        if (ai < bi) {
+        uint64_t di;
+        if (usub64_overflow(ai, bi, &di)) {
             di = 0;
         }
         *(uint64_t *)(d + i) = di;