From 7ce787fe030a2bf16a49cb5a30e6bb521e6507e7 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Thu, 23 Sep 1999 14:58:54 +0000 Subject: [PATCH] Use unsigned shift instead of signed shift. From-SVN: r29621 --- gcc/ChangeLog | 5 +++++ gcc/combine.c | 8 ++++++-- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4cec47efc06..aee30b90278 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Sep 23 15:54:12 1999 Nick Clifton + + * combine.c (simplify_comparison): Use an unsigned shift to adjust + the constant. + Thu Sep 23 08:46:21 1999 Guy Harris * gcc.1: Fix a formatting error. diff --git a/gcc/combine.c b/gcc/combine.c index 6c24caa9afe..0e556db4ab9 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; } -- 2.30.2