https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90256
Bug ID: 90256
Summary: Optimizer with interrupt routines
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nulano at nulano dot eu
Target Milestone: ---
Created attachment 46248
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46248&action=edit
verbose compiler output (MSYS2 GCC 8.3.0)
Enabling optimizer (either -Os or -O2) triggers error "interrupt service
routine can't be called directly" when two interrupt routines have identical
code.
Code to reproduce:
int rand();
int x = 0;
__attribute((interrupt)) void isr1(void*) {
for (int i = 0; i < 10; i++)
x ^= rand();
}
// isr2 is identical to isr1
__attribute((interrupt)) void isr2(void*) {
for (int i = 0; i < 10; i++)
x ^= rand();
}
- compile with "g++ -mgeneral-regs-only -S" -> works
- compile with "g++ -mgeneral-regs-only -S -Os" -> error
Tested on:
- Windows 7 64-bit MSYS2-W64-X86_64 GCC 7.3.0
- Windows 7 64-bit MSYS2-W64-X86_64 GCC 8.3.0
- Linux Mint / Ubuntu GCC 7.3.0
