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| From: | Paolo Bonzini |
| Subject: | Re: [Lightning] Reducing opcode permutations |
| Date: | Fri, 28 Mar 2008 17:20:27 +0100 |
| User-agent: | Thunderbird 2.0.0.12 (Macintosh/20080213) |
jit_movi_i(JIT_R1, INT_MAX) // R1 = 2^31 jit_addci_i(JIT_R0, JIT_R1, 1) // R0 = R1 + 1, set carry jit_addxi_i(JIT_R2, JIT_R0, 0) // R2 = R0 + 0 + carry
Don't confuse carry with overflow. Carry is the same for integer and unsigned integer. Overflow differs, but what tests overflow is boadd/bosub, not addc/addx.
Paolo
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