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Bug#: 39223
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Status: NEW
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Assigned To: Not yet assigned to anyone <unassigned@gcc.gnu.org>
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Reporter: John Regehr <regehr@cs.utah.edu>
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Attachment Description Type Created Size Actions
small.c failure-inducing C program text/x-csrc 2009-02-18 04:58 312 bytes Edit
small.s asm displaying volatile bug application/octet-stream 2009-02-18 04:59 577 bytes Edit
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Description:   Last confirmed: 2009-02-18 15:19 Opened: 2009-02-18 04:58 
This bug is seen using the avr-gcc that is built using the script that comes
with FemtoOS 0.88.

Compile the attached program like this:

  avr-gcc -O -mmcu=atmega128 small.c -S

It can be seen that func_45() unconditionally loads from volatile g_54.  That
is wrong, since in the C code the load is protected by a test.

------- Comment #1 From John Regehr 2009-02-18 04:58 ------- 
Created an attachment (id=17317) [edit]
failure-inducing C program

------- Comment #2 From John Regehr 2009-02-18 04:59 ------- 
Created an attachment (id=17318) [edit]
asm displaying volatile bug

------- Comment #3 From Richard Guenther 2009-02-18 10:03 ------- 
Please fill out GCC version this bug is reported against.

------- Comment #4 From Eric Weddington 2009-02-18 15:19 ------- 
Fail on 4.3.2 with -O1, success with -O[023s].
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