DUALNUM: Improve/fix edge cases of unary minus.HEADv2.1

Thanks to Sergey Kaplun. #1422 #1418

1 files changed, 5 insertions, 1 deletions

diff --git a/src/vm_mips64.dasc b/src/vm_mips64.dasc
index 8365da8e..310269ce 100644
--- a/src/vm_mips64.dasc
+++ b/src/vm_mips64.dasc
@@ -3804,7 +3804,8 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
     |  sextw CARG1, CARG1
     |  beq CARG1, TMP1, ->vmeta_unm     // Meta handler deals with -2^31.
     |.  negu CARG1, CARG1
-    |  zextw CARG1, CARG1
+    |  beqz CARG1, >3
+    |.  zextw CARG1, CARG1
     |  settp CARG1, TISNUM
     |1:
     |  ins_next1
@@ -3816,6 +3817,9 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
     |.  dsll TMP1, TMP1, 32
     |  b <1
     |.  xor CARG1, CARG1, TMP1
+    |3:
+    |  b <1
+    |.  dsll CARG1, TMP1, 32
     break;
   case BC_LEN:
     |  // RA = dst*8, RD = src*8