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From: "joey.ye at arm dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/55757] Suboptimal interrupt prologue/epilogue for ARMv7-M (Cortex-M3) Date: Fri, 21 Dec 2012 03:32:00 -0000 [thread overview] Message-ID: <bug-55757-4-vtPxZqYAeu@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-55757-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55757 --- Comment #5 from Joey Ye <joey.ye at arm dot com> 2012-12-21 03:32:21 UTC --- However, there is room to improve both performance and stack consumption in case of Os: extern void bar(int *); void foo() { int a; bar(&a); } Built with -mcpu=cortex-m3 -Os: push {r0, r1, r2, lr} add r0, sp, #4 bl bar pop {r1, r2, r3, pc} Apparently it should be optimized to save 8 bytes of stack consumption and two stores: push {r0, lr} mov r0, sp bl bar pop {r1, pc}
next prev parent reply other threads:[~2012-12-21 3:32 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-12-20 15:04 [Bug rtl-optimization/55757] New: " freddie_chopin at op dot pl 2012-12-20 15:24 ` [Bug rtl-optimization/55757] " freddie_chopin at op dot pl 2012-12-20 16:52 ` rearnsha at gcc dot gnu.org 2012-12-20 17:08 ` freddie_chopin at op dot pl 2012-12-21 3:23 ` joey.ye at arm dot com 2012-12-21 3:32 ` joey.ye at arm dot com [this message] 2012-12-21 7:09 ` freddie_chopin at op dot pl 2013-03-02 15:23 ` web at brolinembedded dot se 2023-11-28 23:10 ` yann at poupet dot eu
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