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10e702789e
As the associated test case shows, signbit generated assembly is sub-optimal for _Float128 argument from memory on P8 LE. On P8 LE, p8swap pass puts an explicit AND -16 on the memory, which causes mode_dependent_address_p considers it's invalid to change its mode and combine fails to make use of the existing pattern signbit<SIGNBIT:mode>2_dm_mem. Considering it's always more efficient to make use of 8 bytes load and shift on P8 LE, this patch is to adjust the current expander and treat it specially. PR target/114567 gcc/ChangeLog: * config/rs6000/rs6000.md (expander signbit<FLOAT128:mode>2): Adjust. (*signbit<mode>2_dm_mem): Rename to ... (signbit<mode>2_dm_mem): ... this. gcc/testsuite/ChangeLog: * gcc.target/powerpc/pr114567.c: New test. |
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