diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/combine.c | 8 |
2 files changed, 11 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4cec47e..aee30b9 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Sep 23 15:54:12 1999 Nick Clifton <nickc@cygnus.com> + + * combine.c (simplify_comparison): Use an unsigned shift to adjust + the constant. + Thu Sep 23 08:46:21 1999 Guy Harris <guy@netapp.com> * gcc.1: Fix a formatting error. diff --git a/gcc/combine.c b/gcc/combine.c index 6c24caa..0e556db 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -10362,8 +10362,12 @@ simplify_comparison (code, pop0, pop1) & ~ (mask >> (INTVAL (XEXP (op0, 1)) + ! equality_comparison_p))) == 0) { - const_op >>= INTVAL (XEXP (op0, 1)); - op1 = GEN_INT (const_op); + /* We must perform a logical shift, not an arithmetic one, + as we want the top N bits of C to be zero. */ + unsigned HOST_WIDE_INT temp = const_op; + + temp >>= INTVAL (XEXP (op0, 1)); + op1 = GEN_INT (temp); op0 = XEXP (op0, 0); continue; } |