d4cb5d9f2b
Printing the raw symbol is useful in inline asm (e.g. getting the C++
mangled name, referencing a symbol in a custom way while ensuring it is
not optimized out even if internal). Similar constraints are available
in other targets (e.g. "S" for aarch64/riscv, "Cs" for m68k).
```
namespace ns { extern int var, a[4]; }
void foo() {
asm(".pushsection .xxx,\"aw\"; .dc.a %p0; .popsection" :: "Ws"(&ns::var));
asm(".reloc ., BFD_RELOC_NONE, %p0" :: "Ws"(&ns::a[3]));
}
```
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105576
15 lines
480 B
LLVM
15 lines
480 B
LLVM
; RUN: not llc -mtriple=x86_64 < %s 2>&1 | FileCheck %s
|
|
|
|
@a = external global [4 x i32], align 16
|
|
|
|
; CHECK-COUNT-2: error: invalid operand for inline asm constraint 'Ws'
|
|
; CHECK-NOT: error:
|
|
define void @test(i64 %i) {
|
|
entry:
|
|
%x = alloca i32, align 4
|
|
%ai = getelementptr inbounds [4 x i32], ptr @a, i64 0, i64 %i
|
|
call void asm sideeffect "", "^Ws,~{dirflag},~{fpsr},~{flags}"(ptr %x)
|
|
call void asm sideeffect "", "^Ws,~{dirflag},~{fpsr},~{flags}"(ptr %ai)
|
|
ret void
|
|
}
|