https://bugs.llvm.org/show_bug.cgi?id=39446
Bug ID: 39446
Summary: Stack parameter push order incorrect
Product: libraries
Version: 7.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: AVR
Assignee: unassignedb...@nondot.org
Reporter: tetsuya.o...@dsn.rohm.co.jp
CC: llvm-bugs@lists.llvm.org
Created attachment 21037
--> https://bugs.llvm.org/attachment.cgi?id=21037&action=edit
test code for reproduction
If optimize level is -O1, the order of pushing the last parameter and the
second parameter from last into stack is reversed. It leads incorrect result.
Reproduction procedure is to run the command below, where test.c is the
attached file.
clang --target=avr -O1 test.c -S -o test.S
In test.c, the main function calls function f with parameters
0,1,2,3,4,5,6,7,8,9,10 and 11.
But in test.S, the parameter pushing sequence is like below.
ldi r24, 10
push r24
ldi r24, 11
ldi r25, 0
push r25
push r24
ldi r24, 9
ldi r25, 0
I think it supposed to push 11, 10 then 9. But it pushes 10, 11 then 9.
Can anyone fix this problem?
Thank you.
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