I think something strange is being produced by -Os
I reduced a confusing large application to the below code.
Compiling with default optimizaton produced an avr-objdump that follows
the C code as I expected.
avr-gcc -mmcu=atmega16 -c -o err.o err.c
avr-gcc-mmcu=atmega16 err.o -o err.elf
On Wed, 2010-12-29 at 11:48 -0800, Thomas D. Dean wrote:
However, using -Os, I see strange code at c8, ca, etc. The poly
calculation and the sin call seem to be below here. The stack is
cleaned correctly by the 4 ea pop r0's. Why the strange rcalls???
Sorry, should read d0, d2.
tomdean
On Wed, 2010-12-29 at 11:48 -0800, Thomas D. Dean wrote:
Sorry, again. I am really doing good with this post.
avr-gcc --version
avr-gcc (GCC) 4.3.4
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for
Strange rcalls are a fast way to allocate four bytes on the stack for a local...
-Original Message-
From: avr-gcc-list-bounces+larry=barello@nongnu.org
[mailto:avr-gcc-list-bounces+larry=barello@nongnu.org] On Behalf Of Thomas
D. Dean
Sent: Wednesday, December 29, 2010 11:56 AM
On Wed, 2010-12-29 at 13:01 -0800, larry barello wrote:
Strange rcalls are a fast way to allocate four bytes on the stack for a
local...
Thanks, Larry.
Looking thru the code, that is what is happening.
tomdean
___
AVR-GCC-list mailing list
