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Re: [avr-gcc-list] Prologue keeps registers which will not be restored ?
From: |
eric |
Subject: |
Re: [avr-gcc-list] Prologue keeps registers which will not be restored ? |
Date: |
Thu, 12 Jun 2003 12:05:07 GMT |
> Good evening!
>
> Prologue keeps registers which will not be restored ?
> By the way, in the received code an appreciable error.
>
> Programm:
>
> unsigned char f(void);
>
> void foo (void)
> {
> while ( ((f() ^ 1) & 1) == 0 ) ;
> }
>
> Options:
>
> avr-gcc -W -Wall -S -O2 prol-155.c
>
> Result:
>
> .file "prol-155.c"
> .arch avr2
> __SREG__ = 0x3f
> __SP_H__ = 0x3e
> __SP_L__ = 0x3d
> __tmp_reg__ = 0
> __zero_reg__ = 1
> .global __do_copy_data
> .global __do_clear_bss
> .text
> ..global foo
> .type foo, @function
> foo:
> /* prologue: frame size=0 */
> push r28
> /* prologue end (size=1) */
> ..L2:
> rcall f
> rjmp .L2
> /* epilogue: frame size=0 */
> /* epilogue: noreturn */
> /* epilogue end (size=0) */
> /* function foo size 3 (2) */
> .size foo, .-foo
> /* File "prol-155.c": code 3 = 0x0003 ( 2),
prologues 1, epilogues 0
> */
>
Please fill out a GCC bug report, here:
<http://gcc.gnu.org/bugzilla/>
Thanks
Eric
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