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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/64224] New: [ARM] -mapcs -marm uses deprecated forms (as of ARMv7-A) of LDM in epilogues Date: Mon, 08 Dec 2014 14:43:00 -0000 [thread overview] Message-ID: <bug-64224-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64224 Bug ID: 64224 Summary: [ARM] -mapcs -marm uses deprecated forms (as of ARMv7-A) of LDM in epilogues Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: ktkachov at gcc dot gnu.org Reporter: ktkachov at gcc dot gnu.org Target: arm* The ARMv7-A specification says on the load-multiple (LDM) instruction: "The SP can be in the list. However, ARM deprecates using these instructions with SP in the list." and "ARM deprecates using these instructions with both the LR and the PC in the list." However GCC generates both forms in function epilogues when compiling with -mapcs. gas doesn't have a warning for these (I'm working on a patch to add those to gas) which is probably why this hasn't been noticed yet. We should fix GCC so that it doesn't generate deprecated sequences for ARMv7-A and later.
next reply other threads:[~2014-12-08 14:43 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-12-08 14:43 ktkachov at gcc dot gnu.org [this message] 2014-12-08 14:44 ` [Bug target/64224] " ktkachov at gcc dot gnu.org 2014-12-09 0:08 ` rearnsha at gcc dot gnu.org 2014-12-09 8:08 ` ktkachov at gcc dot gnu.org 2015-02-12 15:42 ` mshawcroft at gcc dot gnu.org
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