From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2119) id 160C33850409; Mon, 5 Jul 2021 21:25:49 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 160C33850409 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Jeff Law To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-2042] Remove redundant compare in shift loop on H8 X-Act-Checkin: gcc X-Git-Author: Jeff Law X-Git-Refname: refs/heads/master X-Git-Oldrev: 7d6979197274a662da7bdc564314afe8415865c1 X-Git-Newrev: 1562c7987be115311a75b1074c3768a1b006adb6 Message-Id: <20210705212549.160C33850409@sourceware.org> Date: Mon, 5 Jul 2021 21:25:49 +0000 (GMT) X-BeenThere: gcc-cvs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Jul 2021 21:25:49 -0000 https://gcc.gnu.org/g:1562c7987be115311a75b1074c3768a1b006adb6 commit r12-2042-g1562c7987be115311a75b1074c3768a1b006adb6 Author: Jeff Law Date: Mon Jul 5 17:23:43 2021 -0400 Remove redundant compare in shift loop on H8 gcc/ChangeLog * config/h8300/shiftrotate.md (shift-by-variable patterns): Update to generate condition code aware RTL directly. Diff: --- gcc/config/h8300/shiftrotate.md | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/gcc/config/h8300/shiftrotate.md b/gcc/config/h8300/shiftrotate.md index 0476324bf22..485303cb906 100644 --- a/gcc/config/h8300/shiftrotate.md +++ b/gcc/config/h8300/shiftrotate.md @@ -385,10 +385,15 @@ (parallel [(set (match_dup 0) (match_op_dup 2 [(match_dup 0) (const_int 1)])) - (clobber (scratch:QI))]) - (set (match_dup 1) (plus:QI (match_dup 1) (const_int -1))) + (clobber (reg:CC CC_REG))]) + (parallel + [(set (reg:CCZN CC_REG) + (compare:CCZN + (plus:QI (match_dup 1) (const_int -1)) + (const_int 0))) + (set (match_dup 1) (plus:QI (match_dup 1) (const_int -1)))]) (set (pc) - (if_then_else (ne (match_dup 1) (const_int 0)) + (if_then_else (ne (reg:CCZN CC_REG) (const_int 0)) (label_ref (match_dup 4)) (pc))) (match_dup 5)] @@ -416,10 +421,15 @@ (parallel [(set (match_dup 0) (match_op_dup 2 [(match_dup 0) (const_int 1)])) - (clobber (scratch:QI))]) - (set (match_dup 3) (plus:QI (match_dup 3) (const_int -1))) + (clobber (reg:CC CC_REG))]) + (parallel + [(set (reg:CCZN CC_REG) + (compare:CCZN + (plus:QI (match_dup 3) (const_int -1)) + (const_int 0))) + (set (match_dup 3) (plus:QI (match_dup 3) (const_int -1)))]) (set (pc) - (if_then_else (ne (match_dup 3) (const_int 0)) + (if_then_else (ne (reg:CCZN CC_REG) (const_int 0)) (label_ref (match_dup 4)) (pc))) (match_dup 5)]