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On Tue, Oct 4, 2011 at 6:06 PM, H.J. Lu <hjl.tools@gmail.com> wrote: >> OTOH, x86_64 and i686 targets can also benefit from this change. If >> combine can't create more complex address (covered by lea), then it >> will simply propagate memory operand back into the add insn. It looks >> to me that we can't loose here, so: >> >> ?/* Improve address combine. ?*/ >> ?if (code == PLUS && MEM_P (src2)) >> ? ?src2 = force_reg (mode, src2); >> >> Any opinions? >> > > It doesn't work with 64bit libstdc++: Yeah, yeah. ix86_output_mi_thunk has some ... issues. Please try attached patch that introduces ix86_emit_binop and uses it in a bunch of places. Uros.
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