https://bugs.llvm.org/show_bug.cgi?id=48471
Bug ID: 48471
Summary: ARM interrupt attribute warning incorrect for
M-profile
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
If you compile the following
extern void fn(void);
__attribute__((interrupt)) void example(void) {
fn();
return;
}
with --target=arm-none-eabi -mcpu=cortex-m7 you get
tmp.c:3:3: warning: call to function without interrupt attribute could clobber
interruptee's VFP registers [-Wextra]
fn();
^
This warning is incorrect for M-profile CPUs, as VFP registers are
automatically saved and later restored in M-profile CPUs when entering an
exception (or when a VFP register is modified in an exception handler if lazy
context save is enabled).
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