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From: Max Filippov <jcmvbkbc@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-5121] xtensa: Optimize ctzsi2 and ffssi2 a bit Date: Thu, 12 Jan 2023 12:44:56 +0000 (GMT) [thread overview] Message-ID: <20230112124456.64A743857C44@sourceware.org> (raw) https://gcc.gnu.org/g:117be79bd84ed21b47588d0cd86d72d5d1757cae commit r13-5121-g117be79bd84ed21b47588d0cd86d72d5d1757cae Author: Takayuki 'January June' Suwa <jjsuwa_sys3175@yahoo.co.jp> Date: Thu Jan 12 13:26:42 2023 +0900 xtensa: Optimize ctzsi2 and ffssi2 a bit This patch saves one byte when the Code Density Option is enabled, gcc/ChangeLog: * config/xtensa/xtensa.md (ctzsi2, ffssi2): Rearrange the emitting codes. Diff: --- gcc/config/xtensa/xtensa.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md index b4989832169..764da63f91c 100644 --- a/gcc/config/xtensa/xtensa.md +++ b/gcc/config/xtensa/xtensa.md @@ -477,8 +477,8 @@ emit_insn (gen_negsi2 (temp, operands[1])); emit_insn (gen_andsi3 (temp, temp, operands[1])); emit_insn (gen_clzsi2 (temp, temp)); - emit_insn (gen_negsi2 (temp, temp)); - emit_insn (gen_addsi3 (operands[0], temp, GEN_INT (31))); + emit_move_insn (operands[0], GEN_INT (31)); + emit_insn (gen_subsi3 (operands[0], operands[0], temp)); DONE; }) @@ -491,8 +491,8 @@ emit_insn (gen_negsi2 (temp, operands[1])); emit_insn (gen_andsi3 (temp, temp, operands[1])); emit_insn (gen_clzsi2 (temp, temp)); - emit_insn (gen_negsi2 (temp, temp)); - emit_insn (gen_addsi3 (operands[0], temp, GEN_INT (32))); + emit_move_insn (operands[0], GEN_INT (32)); + emit_insn (gen_subsi3 (operands[0], operands[0], temp)); DONE; })
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