http://llvm.org/bugs/show_bug.cgi?id=16387
Bug ID: 16387
Summary: clang doesn't produce ARM EABI-compliant modulo
runtime function
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
For the following program:
$ cat divmod.c
int f(int a, int b) {
int d = a/b;
int m = a%b;
int c = b%a;
return d+m+c;
}
compiled with the following command line:
clang -O3 -target armv7a-none-none-eabi -mcpu=cortex-a8 divmod.c -S
clang produces code that is not EABI compliant:
f:
push {r4, r5, r6, r11, lr}
add r11, sp, #12
sub sp, sp, #4
mov r5, r1
mov r4, r0
bl __aeabi_idiv
mov r6, r0
mov r0, r4
mov r1, r5
bl __modsi3
add r6, r0, r6
mov r0, r5
mov r1, r4
bl __modsi3
add r0, r6, r0
sub sp, r11, #12
pop {r4, r5, r6, r11, pc}
The problem is the calls to __modsi3. These are not compliant with the EABI.
Instead, clang should produce calls to __aeabi_idivmod or __aeabi_uidivmod for
modulo operations when producing EABI-compliant code.
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