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* 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. From-SVN: r70455 |
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