http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58152
Bug ID: 58152
Summary: ARM: unnecessary push before call to noreturn function
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: jay.foad at gmail dot com
Created attachment 30652
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30652&action=edit
C source for testcase
On the attached test case I get:
$ gcc -marm -S -O2 ~/mul.c -o - -fomit-frame-pointer -march=armv6
...
mul:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
smull r0, r1, r0, r1
cmp r1, r0, asr #31
bxeq lr
stmfd sp!, {r3, lr}
bl overflow
The stmfd instruction is completely unnecessary.
I'm using gcc built from svn r201719 configured with --target=arm-eabi.
