X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=deps%2Flightning%2Flib%2Fjit_s390-cpu.c;h=55b7e1fe2adcff320b5c12fbf589a4f6227d46b0;hb=c0c162422385a60ea7c8fa1dfe439e83e0a13d88;hp=2c107877aaba263b5d82a9d4569b3ee14049623e;hpb=fdf33147c33ab1cb27c4bd06b377f744411030c3;p=pcsx_rearmed.git

diff --git a/deps/lightning/lib/jit_s390-cpu.c b/deps/lightning/lib/jit_s390-cpu.c
index 2c107877..55b7e1fe 100644
--- a/deps/lightning/lib/jit_s390-cpu.c
+++ b/deps/lightning/lib/jit_s390-cpu.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2019  Free Software Foundation, Inc.
+ * Copyright (C) 2013-2022  Free Software Foundation, Inc.
  *
  * This file is part of GNU lightning.
  *
@@ -2477,7 +2477,33 @@ static void
 _casx(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1,
       jit_int32_t r2, jit_int32_t r3, jit_word_t i0)
 {
-    fallback_casx(r0, r1, r2, r3, i0);
+    jit_int32_t         iscasi, r1_reg;
+    if ((iscasi = (r1 == _NOREG))) {
+        r1_reg = jit_get_reg_but_zero(0);
+        r1 = rn(r1_reg);
+        movi(r1, i0);
+    }
+    /* Do not clobber r2 */
+    movr(r0, r2);
+    /*  The CS and CSG instructions below effectively do atomically:
+     * if (*r1 == r0)
+     *     *r1 = r3;
+     * else
+     *     r0 = *r1
+     * So, we do not need to check cpu flags to know if it did work,
+     * just compare if values are different.
+     * Obviously it is somewhat of undefined behavior if old_value (r2)
+     * and new_value (r3) have the same value, but should still work
+     * as expected as a noop.
+     */
+#  if __WORDSIZE == 32
+    CS(r0, r3, 0, r1);
+#  else
+    CSG(r0, r3, 0, r1);
+#  endif
+    eqr(r0, r0, r2);
+    if (iscasi)
+        jit_unget_reg(r1_reg);
 }
 
 static void