Do not convert a subtract of zero into an add of zero.

[deliverable/binutils-gdb.git] / gas / config / tc-arm.c

diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index 162553f6436b8581185bd6bd4f6898bfac87084a..1370f13e5ae8f0bf8b9b2a038f1bc0be8dad7bde 100644 (file)
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -7433,11 +7433,11 @@ thumb_add_sub (str, subtract)
          int offset = inst.reloc.exp.X_add_number;
 
          if (subtract)
-           offset = -offset;
+           offset = - offset;
 
          if (offset < 0)
            {
-             offset = -offset;
+             offset = - offset;
              subtract = 1;
 
              /* Quick check, in case offset is MIN_INT.  */
@@ -7447,7 +7447,9 @@ thumb_add_sub (str, subtract)
                  return;
                }
            }
-         else
+         /* Note - you cannot convert a subtract of 0 into an
+            add of 0 because the carry flag is set differently.  */
+         else if (offset > 0)
            subtract = 0;
 
          if (Rd == REG_SP)