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Diffstat (limited to 'gcc/ChangeLog')
| -rw-r--r-- | gcc/ChangeLog | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 248ee4f..159dc12 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,17 @@ +2003-08-14 Roger Sayle <roger@eyesopen.com> + + * fold-const.c (negate_expr_p): MULT_EXPRs and RDIV_EXPRs are easy + to negate if either operand is easy to negate, if we don't care + about sign-dependent rounding. + (negate_expr): Make the logic to negate a REAL_CST explicit. + Attempt to negate a MULT_EXPR or RDIV_EXPR by negating an operand + that's easy to negate, if we don't honor sign-dependent rounding. + (fold <MULT_EXPR>): Optimize -A * B as A * -B if B is easy to + negate, and the symmetric A * -B as -A * B if A is easy to negate. + (fold <RDIV_EXPR>): Likewise, optimize -A/B and C/-D as A/-B and + -C/D if B and C are cheap to negate. Add an explicit rule to + optimize X/-1.0 as -X when we don't care about signaling NaNs. + 2003-08-14 Zack Weinberg <zack@codesourcery.com> * Makefile.in (tm_file): Rename tm_include_list. |