On Wed, 2016-03-02 at 14:25 +0000, Renato Golin wrote: > On 2 March 2016 at 11:35, Edward Nevill <edward.nev...@linaro.org> wrote: > > cmp x2, 8 <<< (1) > > (1) If count as a 64 bit unsigned is <= 8 then it is probably still <= 8 as > > a 32 bit unsigned. > > You mean to use "cmp w2, 8" instead? Is there any difference?
No. Look at the assembler again > pd_disjoint_words: > cmp x2, 8 <<< (1) > sub sp, sp, #64 <<< (2) > bhi .L2 > cmp w2, 8 <<< (1) > bls .L15 It is doing cmp x2, 8 then a few instructions later, without modifying x2/w2 and without any intervening branch destinations it does cmp w2, 8. I assert the 2nd cmp w2, 8 and bls are redundant, because we know it is (unsigned) <= 8 already. > Have you tried building OpenJDK with Clang? No. I might if you can provide me a binary. Thanks, Ed. _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org https://lists.linaro.org/mailman/listinfo/linaro-toolchain
