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| author | Nick Clifton <nickc@cygnus.com> | 1999-09-23 14:58:54 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 1999-09-23 14:58:54 +0000 |
| commit | 7ce787fe030a2bf16a49cb5a30e6bb521e6507e7 (patch) | |
| tree | 2344a439cc8ccd4a2cce268c1bd8e94780f71e05 | |
| parent | f8540d767f7e9fcd91b13f883cd2681929e94901 (diff) | |
| download | gcc-7ce787fe030a2bf16a49cb5a30e6bb521e6507e7.zip gcc-7ce787fe030a2bf16a49cb5a30e6bb521e6507e7.tar.gz gcc-7ce787fe030a2bf16a49cb5a30e6bb521e6507e7.tar.bz2 | |
Use unsigned shift instead of signed shift.
From-SVN: r29621
| -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; } |