https://llvm.org/bugs/show_bug.cgi?id=27068
Bug ID: 27068
Summary: ARM backend uses different ABI functions based on
optimization level
Product: new-bugs
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
I'm using a build found here: http://llvm.org/apt/
$ clang-3.8 --version
Ubuntu clang version 3.8.0-svn257311-1~exp1 (trunk) (based on LLVM 3.8.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
The example program:
$ cat int.c
int f(int a, int b)
{
return a % b;
}
-O0 uses __modsi3 (GNU style (?), not ARM EABI compliant)
$ clang-3.8 int.c -S -O0 -target arm-linux-androideabi -march=armv7-a -o - |
grep mod | grep bl
bl __modsi3
-O1 uses __aeabi_idivmod (ARM EABI compliant)
$ clang-3.8 int.c -S -O1 -target arm-linux-androideabi -march=armv7-a -o - |
grep mod | grep bl
bl __aeabi_idivmod(PLT)
I expect ARM EABI compliant code to be generated. On top of that, I expect the
ABI not to vary based on optimization level.
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