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[Bug rtl-optimization/49157] Unnecessary stack save/restore code generated for a leaf function (arm-elf-gcc)
- From: "ramana at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 1 Jun 2011 19:56:36 +0000
- Subject: [Bug rtl-optimization/49157] Unnecessary stack save/restore code generated for a leaf function (arm-elf-gcc)
- Auto-submitted: auto-generated
- References: <bug-49157-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49157
Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011.06.01 19:56:05
CC| |ramana at gcc dot gnu.org
Ever Confirmed|0 |1
--- Comment #1 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2011-06-01 19:56:05 UTC ---
With an arm-linux-gnueabi toolchain I see the following code - it's pointless
creating space on the stack in this case.
foo:
@ args = 0, pretend = 0, frame = 8
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
add r0, r0, r0, lsr #16
sub sp, sp, #8
sxth r0, r0
add sp, sp, #8
bx lr
Possibly related to PR36409.
Ramana