238273fe06
This patch addresses constant handling in subvsi4. Either operand may be a constant. If the second input (operand[2]) is a constant, then we can canonicalize this into an addition form, providing we take care of the INT_MIN case. In that case the negation has to handle the fact that -INT_MIN is still INT_MIN and we need to ensure that a subtract operation is performed rather than an addition. The remaining cases are largely duals of the usubvsi4 expansion. This patch also fixes a technical correctness bug in the old expansion, where we did not realy describe the test for overflow in the RTL. We seem to have got away with that, however... * config/arm/arm.md (subv<mode>4): Delete. (subvdi4): New expander pattern. (subvsi4): Likewise. Handle some immediate values. (subvsi3_intmin): New insn pattern. (subvsi3): Likewise. (subvsi3_imm1): Likewise. * config/arm/arm.c (select_cc_mode): Also allow minus for CC_V idioms. From-SVN: r277189 |
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| config | ||
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