https://bugs.llvm.org/show_bug.cgi?id=44435
Bug ID: 44435
Summary: clang does not fully grok 'register asm("x")'
declarations for powerpc
Product: clang
Version: 9.0
Hardware: Other
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
This may be a general bug, but I've only tested on powerpc64.
libreoffice uses asm register allocations a'la:
register long r3 asm("r3");
With gcc, it allocates register r3 to the variable, but clang ignores the asm
bit, and treats it as an uninitialized variable, leading to crashes in
libreoffice.
A trivial example program:
#include <stdio.h>
int main(int argc, char **argv)
{
register long x asm("r3");
printf("%ld, %d\n", x, argc);
return (0);
}
Built with clang:
[chmeee@ralga:pts/12]:~> ./test_regasm
4611686018427378136, 1
Built with gcc9:
[chmeee@ralga:pts/12]:~> ./test_regasm
1, 1
r3 on entry is argc, so it should print 1 for both arguments.
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