llvm-project/clang/test/PCH/asm.h

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// Header for the PCH test asm.c
void f() {
int i,cond;
asm ("foo\n" : : "a" (i + 2));
asm ("foo\n" : [symbolic_name] "=a" (i) : "[symbolic_name]" (i));
asm volatile goto("testl %0, %0; jne %l1;" :: "r"(cond)::label_true, loop);
label_true:
loop:
return;
}
void clobbers() {
asm ("nop" : : : "ax", "#ax", "%ax");
asm ("nop" : : : "eax", "rax", "ah", "al");
asm ("nop" : : : "0", "%0", "#0");
}