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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/41742] Unnecessary zero-extension at -O2 but not -O1 Date: Thu, 23 Mar 2023 13:54:19 +0000 [thread overview] Message-ID: <bug-41742-4-esiMA1pXHs@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-41742-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41742 Peter Bergner <bergner at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bergner at gcc dot gnu.org --- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> --- Update: current code (both powerpc64-linux and powerpc64le-linux) still contain the unneeded rlwinm, but now we've replaced the loop with a call to libc's memset and we do not shrink-wrap the call due to the use of the non-volatile r31 in the entry block. foo: cmpdi 0,5,0 std 31,-8(1) stdu 1,-128(1) mr 31,3 beq 0,.L4 mflr 0 rlwinm 4,4,0,0xff std 0,144(1) bl memset nop ld 0,144(1) mtlr 0 .L4: addi 1,1,128 mr 3,31 ld 31,-8(1) blr
next prev parent reply other threads:[~2023-03-23 13:54 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-41742-4@http.gcc.gnu.org/bugzilla/> 2012-08-16 10:40 ` segher at gcc dot gnu.org 2021-08-16 8:07 ` pinskia at gcc dot gnu.org 2023-03-23 13:54 ` bergner at gcc dot gnu.org [this message] 2023-04-11 17:07 ` aagarwa at gcc dot gnu.org
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