https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104375
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>: https://gcc.gnu.org/g:102237c9f2f2667eb73cb5473bd3a9a97296a414 commit r13-581-g102237c9f2f2667eb73cb5473bd3a9a97296a414 Author: liuhongt <hongtao....@intel.com> Date: Thu Apr 28 15:30:06 2022 +0800 recognize bzhi pattern when there's zero_extendsidi. backend has 16550(define_insn "*bmi2_bzhi_<mode>3_2" 16551 [(set (match_operand:SWI48 0 "register_operand" "=r") 16552 (and:SWI48 16553 (plus:SWI48 16554 (ashift:SWI48 (const_int 1) 16555 (match_operand:QI 2 "register_operand" "r")) 16556 (const_int -1)) 16557 (match_operand:SWI48 1 "nonimmediate_operand" "rm"))) 16558 (clobber (reg:CC FLAGS_REG))] 16559 "TARGET_BMI2" 16560 "bzhi\t{%<k>2, %1, %0|%0, %1, %<k>2}" 16561 [(set_attr "type" "bitmanip") 16562 (set_attr "prefix" "vex") 16563 (set_attr "mode" "<MODE>")]) But there's extra zero_extend in pattern match. 424Failed to match this instruction: 425(parallel [ 426 (set (reg:DI 90) 427 (zero_extend:DI (and:SI (plus:SI (ashift:SI (const_int 1 [0x1]) 428 (subreg:QI (reg:SI 98) 0)) 429 (const_int -1 [0xffffffffffffffff])) 430 (subreg:SI (reg:DI 95) 0)))) 431 (clobber (reg:CC 17 flags)) 432 ]) Add new define_insn for it. gcc/ChangeLog: PR target/104375 * config/i386/i386.md (*bmi2_bzhi_zero_extendsidi_4): New define_insn. gcc/testsuite/ChangeLog: * gcc.target/i386/pr104375.c: New test.
