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From: Philipp Tomsich <ptomsich@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc(refs/vendors/vrull/heads/for-upstream)] RISC-V: branch-(not)equals-zero compares against $zero Date: Fri, 18 Nov 2022 20:22:07 +0000 (GMT) [thread overview] Message-ID: <20221118202207.2A6973853D59@sourceware.org> (raw) https://gcc.gnu.org/g:800ff3743bc2d47f30331dc802da5ae8e70db8ca commit 800ff3743bc2d47f30331dc802da5ae8e70db8ca Author: Philipp Tomsich <philipp.tomsich@vrull.eu> Date: Sun Aug 30 21:02:36 2020 +0200 RISC-V: branch-(not)equals-zero compares against $zero If we are testing a register or a paradoxical subreg (i.e. anything that is not a partial subreg) for equality/non-equality with zero, we can generate a branch that compares against $zero. This will work for QI, HI, SI and DImode, so we enable this for ANYI. 2020-08-30 gcc/ChangeLog: * config/riscv/riscv.md (*branch<mode>_equals_zero): Added pattern. Series-to: gcc-patches@gcc.gnu.org Series-cc: Palmer Dabbelt <palmer@rivosinc.com> Series-cc: Vineet Gupta <vineetg@rivosinc.com> Series-cc: Christoph Muellner <christoph.muellner@vrull.eu> Series-cc: Kito Cheng <kito.cheng@gmail.com> Series-cc: Jeff Law <jlaw@ventanamicro.com> Diff: --- gcc/config/riscv/riscv.md | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md index b7bb338ac04..b616c1915df 100644 --- a/gcc/config/riscv/riscv.md +++ b/gcc/config/riscv/riscv.md @@ -2267,6 +2267,19 @@ operands[7] = GEN_INT (leading + trailing); }) +(define_insn "*branch<mode>_equals_zero" + [(set (pc) + (if_then_else + (match_operator 1 "equality_operator" + [(match_operand:ANYI 2 "register_operand" "r") + (const_int 0)]) + (label_ref (match_operand 0 "" "")) + (pc)))] + "!partial_subreg_p (operands[2])" + "b%C1\t%2,zero,%0" + [(set_attr "type" "branch") + (set_attr "mode" "none")]) + (define_insn "*branch<mode>" [(set (pc) (if_then_else
next reply other threads:[~2022-11-18 20:22 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-18 20:22 Philipp Tomsich [this message] -- strict thread matches above, loose matches on Subject: below -- 2022-11-18 20:25 Philipp Tomsich 2022-11-18 11:34 Philipp Tomsich 2022-11-17 22:24 Philipp Tomsich 2022-11-15 14:00 Philipp Tomsich
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