clang/test/CodeGenCXX/ms-inline-asm-return.cpp

// REQUIRES: x86-registered-target
// RUN: %clang_cc1 %s -triple i686-pc-windows-msvc -emit-llvm -o - -fasm-blocks | FileCheck %s

// Check that we take EAX or EAX:EDX and return it from these functions for MSVC
// compatibility.

extern "C" {

long long f_i64() {
  __asm {
    mov eax, 1
    mov edx, 1
  }
}
// CHECK-LABEL: define dso_local i64 @f_i64()
// CHECK: %[[r:[^ ]*]] = call i64 asm sideeffect inteldialect "mov eax, $$1\0A\09mov edx, $$1", "=&A,{{.*}}"
// CHECK: ret i64 %[[r]]

long long f_i64_reverse() {
  __asm {
    mov edx, 1
    mov eax, 1
  }
}
// CHECK-LABEL: define dso_local i64 @f_i64_reverse()
// CHECK: %[[r:[^ ]*]] = call i64 asm sideeffect inteldialect "mov edx, $$1\0A\09mov eax, $$1", "=&A,{{.*}}"
// CHECK: ret i64 %[[r]]

int f_i32() {
  __asm {
    mov eax, 1
    mov edx, 1
  }
}
// CHECK-LABEL: define dso_local i32 @f_i32()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov eax, $$1\0A\09mov edx, $$1", "=&{eax},~{edx},{{.*}}"
// CHECK: ret i32 %[[r]]

int f_i32_reverse() {
  __asm {
    mov edx, 1
    mov eax, 1
  }
}
// CHECK-LABEL: define dso_local i32 @f_i32_reverse()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov edx, $$1\0A\09mov eax, $$1", "=&{eax},~{edx},{{.*}}"
// CHECK: ret i32 %[[r]]

int f_i32_edx() {
  __asm {
    mov edx, 1
  }
}
// CHECK-LABEL: define dso_local i32 @f_i32_edx()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov edx, $$1", "={eax},~{edx},{{.*}}"
// CHECK: ret i32 %[[r]]

short f_i16() {
  __asm {
    mov eax, 1
    mov edx, 1
  }
}
// CHECK-LABEL: define dso_local signext i16 @f_i16()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov eax, $$1\0A\09mov edx, $$1", "=&{eax},~{edx},{{.*}}"
// CHECK: %[[r_i16:[^ ]*]] = trunc i32 %[[r]] to i16
// CHECK: ret i16 %[[r_i16]]

char f_i8() {
  __asm {
    mov eax, 1
    mov edx, 1
  }
}
// CHECK-LABEL: define dso_local signext i8 @f_i8()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov eax, $$1\0A\09mov edx, $$1", "=&{eax},~{edx},{{.*}}"
// CHECK: %[[r_i8:[^ ]*]] = trunc i32 %[[r]] to i8
// CHECK: ret i8 %[[r_i8]]

bool f_i1() {
  __asm {
    mov eax, 1L
    mov edx, 1U
  }
}
// CHECK-LABEL: define dso_local zeroext i1 @f_i1()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov eax, $$1\0A\09mov edx, $$1", "=&{eax},~{edx},{{.*}}"
// CHECK: %[[r_i8:[^ ]*]] = trunc i32 %[[r]] to i8
// CHECK: store i8 %[[r_i8]], ptr %{{.*}}
// CHECK: %[[r_i1:[^ ]*]] = load i1, ptr %{{.*}}
// CHECK: ret i1 %[[r_i1]]

struct FourChars {
  char a, b, c, d;
};
FourChars f_s4() {
  __asm {
    mov eax, 0x01010101
  }
}
// CHECK-LABEL: define dso_local i32 @f_s4()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "mov eax, $$16843009", "=&{eax},{{.*}}"
// CHECK: store i32 %[[r]], ptr %{{.*}}
// CHECK: %[[r_i32:[^ ]*]] = load i32, ptr %{{.*}}
// CHECK: ret i32 %[[r_i32]]

struct EightChars {
  char a, b, c, d, e, f, g, h;
};
EightChars f_s8() {
  __asm {
    mov eax, 01010101h
    mov edx, 01010101b
  }
}
// CHECK-LABEL: define dso_local i64 @f_s8()
// CHECK: %[[r:[^ ]*]] = call i64 asm sideeffect inteldialect "mov eax, $$16843009\0A\09mov edx, $$85", "=&A,{{.*}}"
// CHECK: store i64 %[[r]], ptr %{{.*}}
// CHECK: %[[r_i64:[^ ]*]] = load i64, ptr %{{.*}}
// CHECK: ret i64 %[[r_i64]]

} // extern "C"

int main() {
  __asm xor eax, eax
}
// CHECK-LABEL: define dso_local noundef i32 @main()
// CHECK: %[[r:[^ ]*]] = call i32 asm sideeffect inteldialect "xor eax, eax", "=&{eax},{{.*}}"
// CHECK: ret i32 %[[r]]