af74bfeee1
In a small number of cases it is preferable to handle comparisons with constants using the sequence RSBS tmp, Xlo, constlo RSCS tmp, Xhi, consthi which allows us to handle a small number of LE/GT/LEU/GEU cases when changing the code to use LT/GE/LTU/GEU would make the constant more expensive. Sadly, we cannot do this on Thumb, since we need RSC, so we now always use the incremented constant in that case since normally that still works out cheaper than forcing the entire constant into a register. Further investigation has also shown that the canonicalization of a reverse subtract and compare is valid for signed as well as unsigned value, so we relax the restriction on selecting CC_RSBmode to allow all types of compare. * config/arm/arm.c (arm_const_double_prefer_rsbs_rsc): New function. (arm_canonicalize_comparison): For GT/LE/GTU/GEU, use the constant unchanged only if that will be cheaper. (arm_select_cc_mode): Recognize a swapped comparison that will be regenerated using RSBS or RSCS. Relax restriction on selecting CC_RSBmode. (arm_gen_dicompare_reg): Handle LE/GT/LEU/GEU comparisons against a constant. (arm_gen_compare_reg): Handle compare (CONST, X) when the mode is CC_RSBmode. (maybe_get_arm_condition_code): CC_RSBmode now returns the same codes as CCmode. * config/arm/arm.md (rsb_imm_compare_scratch): New pattern. (rscsi3_<CC_EXTEND>out_scratch): New pattern. From-SVN: r277180 |
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