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From: "senthil_kumar.selvaraj at atmel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/65657] [avr] read from __memx address space tramples argument to following function
Date: Tue, 07 Apr 2015 20:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65657

Senthil Kumar Selvaraj <senthil_kumar.selvaraj at atmel dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |senthil_kumar.selvaraj@atme
                   |                            |l.com

--- Comment #3 from Senthil Kumar Selvaraj <senthil_kumar.selvaraj at atmel dot com> ---
Happens on a recent trunk build as well.

Here's a simpler testcase.
$ cat foo.c
void foo (char a, unsigned int b);
void readx (const char __memx *x)
{
    foo (*x, 0xABCD);
}
$ avr-gcc -mmcu=atmega1280 foo.c -S -Os
$ cat foo.s
<snip>
    mov r18,r22
    mov r25,r23
    ldi r22,lo8(-51); Load 0xABCD into r22:r23 in prep for call to foo
    ldi r23,lo8(-85)
    mov r30,r18
    mov r31,r25
    mov r21,r24
    call __xload_1; r22 clobbered here
    mov r24,r22
    jmp foo