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| author | Takayuki 'January June' Suwa <jjsuwa_sys3175@yahoo.co.jp> | 2023-01-12 13:26:42 +0900 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2023-01-12 04:44:06 -0800 |
| commit | 117be79bd84ed21b47588d0cd86d72d5d1757cae (patch) | |
| tree | 66de3fca6c104561bf3afa8058b60d104c6f3cd4 | |
| parent | bb65bd084a8739feb5b85f87135c531fc8b86572 (diff) | |
| download | gcc-117be79bd84ed21b47588d0cd86d72d5d1757cae.zip gcc-117be79bd84ed21b47588d0cd86d72d5d1757cae.tar.gz gcc-117be79bd84ed21b47588d0cd86d72d5d1757cae.tar.bz2 | |
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.
| -rw-r--r-- | gcc/config/xtensa/xtensa.md | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md index b498983..764da63 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; }) |