llvm-project/clang/test/CodeGen/aarch64-inline-asm.c

// RUN: %clang_cc1 -triple arm64-none-linux-gnu -emit-llvm -o - %s | FileCheck %s

// The only part clang really deals with is the lvalue/rvalue
// distinction on constraints. It's sufficient to emit llvm and make
// sure that's sane.

long var;

void test_generic_constraints(int var32, long var64) {
    asm("add %0, %1, %1" : "=r"(var32) : "0"(var32));
// CHECK: [[R32_ARG:%[a-zA-Z0-9]+]] = load i32*
// CHECK: call i32 asm "add $0, $1, $1", "=r,0"(i32 [[R32_ARG]])

    asm("add %0, %1, %1" : "=r"(var64) : "0"(var64));
// CHECK: [[R32_ARG:%[a-zA-Z0-9]+]] = load i64*
// CHECK: call i64 asm "add $0, $1, $1", "=r,0"(i64 [[R32_ARG]])

    asm("ldr %0, %1" : "=r"(var32) : "m"(var));
    asm("ldr %0, [%1]" : "=r"(var64) : "r"(&var));
// CHECK: call i32 asm "ldr $0, $1", "=r,*m"(i64* @var)
// CHECK: call i64 asm "ldr $0, [$1]", "=r,r"(i64* @var)
}

float f;
double d;
void test_constraint_w() {
    asm("fadd %s0, %s1, %s1" : "=w"(f) : "w"(f));
// CHECK: [[FLT_ARG:%[a-zA-Z_0-9]+]] = load float* @f
// CHECK: call float asm "fadd ${0:s}, ${1:s}, ${1:s}", "=w,w"(float [[FLT_ARG]])

    asm("fadd %d0, %d1, %d1" : "=w"(d) : "w"(d));
// CHECK: [[DBL_ARG:%[a-zA-Z_0-9]+]] = load double* @d
// CHECK: call double asm "fadd ${0:d}, ${1:d}, ${1:d}", "=w,w"(double [[DBL_ARG]])
}

void test_constraints_immed(void) {
    asm("add x0, x0, %0" : : "I"(4095) : "x0");
    asm("and w0, w0, %0" : : "K"(0xaaaaaaaa) : "w0");
    asm("and x0, x0, %0" : : "L"(0xaaaaaaaaaaaaaaaa) : "x0");
// CHECK: call void asm sideeffect "add x0, x0, $0", "I,~{x0}"(i32 4095)
// CHECK: call void asm sideeffect "and w0, w0, $0", "K,~{w0}"(i32 -1431655766)
// CHECK: call void asm sideeffect "and x0, x0, $0", "L,~{x0}"(i64 -6148914691236517206)
}

void test_constraint_S(void) {
    int *addr;
    asm("adrp %0, %A1\n\t"
        "add %0, %0, %L1" : "=r"(addr) : "S"(&var));
// CHECK: call i32* asm "adrp $0, ${1:A}\0A\09add $0, $0, ${1:L}", "=r,S"(i64* @var)
}

void test_constraint_Q(void) {
    int val;
    asm("ldxr %0, %1" : "=r"(val) : "Q"(var));
// CHECK: call i32 asm "ldxr $0, $1", "=r,*Q"(i64* @var)
}