[arm] Implement negscc using SBC when appropriate.

[thirdparty/gcc.git] / gcc / ChangeLog

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+2019-10-18  Richard Earnshaw  <rearnsha@arm.com>
+
+       * config/arm/arm.md (negscc_borrow): New pattern.
+       (mov_negscc): Don't split if the insn would match negscc_borrow.
+       * config/arm/thumb2.md (thumb2_mov_negscc): Likewise.
+       (thumb2_mov_negscc_strict_it): Likewise.
+
 2019-10-18  Richard Earnshaw  <rearnsha@arm.com>
 
        * config/arm/arm.c (arm_insn_cost): New function.