llvm-project/llvm/test/CodeGen/WebAssembly/call.ll

; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt | FileCheck %s
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -fast-isel -fast-isel-abort=1 | FileCheck %s

; Test that basic call operations assemble as expected.

target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"

declare i32 @i32_nullary()
declare i32 @i32_unary(i32)
declare i32 @i32_binary(i32, i32)
declare i64 @i64_nullary()
declare float @float_nullary()
declare double @double_nullary()
declare void @void_nullary()

; CHECK-LABEL: call_i32_nullary:
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: {{^}} i32.call $push[[NUM:[0-9]+]]=, i32_nullary@FUNCTION{{$}}
; CHECK-NEXT: return $pop[[NUM]]{{$}}
define i32 @call_i32_nullary() {
  %r = call i32 @i32_nullary()
  ret i32 %r
}

; CHECK-LABEL: call_i64_nullary:
; CHECK-NEXT: .result i64{{$}}
; CHECK-NEXT: {{^}} i64.call $push[[NUM:[0-9]+]]=, i64_nullary@FUNCTION{{$}}
; CHECK-NEXT: return $pop[[NUM]]{{$}}
define i64 @call_i64_nullary() {
  %r = call i64 @i64_nullary()
  ret i64 %r
}

; CHECK-LABEL: call_float_nullary:
; CHECK-NEXT: .result f32{{$}}
; CHECK-NEXT: {{^}} f32.call $push[[NUM:[0-9]+]]=, float_nullary@FUNCTION{{$}}
; CHECK-NEXT: return $pop[[NUM]]{{$}}
define float @call_float_nullary() {
  %r = call float @float_nullary()
  ret float %r
}

; CHECK-LABEL: call_double_nullary:
; CHECK-NEXT: .result f64{{$}}
; CHECK-NEXT: {{^}} f64.call $push[[NUM:[0-9]+]]=, double_nullary@FUNCTION{{$}}
; CHECK-NEXT: return $pop[[NUM]]{{$}}
define double @call_double_nullary() {
  %r = call double @double_nullary()
  ret double %r
}

; CHECK-LABEL: call_void_nullary:
; CHECK-NEXT: {{^}} call void_nullary@FUNCTION{{$}}
; CHECK-NEXT: return{{$}}
define void @call_void_nullary() {
  call void @void_nullary()
  ret void
}

; CHECK-LABEL: call_i32_unary:
; CHECK-NEXT: .param i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: {{^}} i32.call $push[[NUM:[0-9]+]]=, i32_unary@FUNCTION, $0{{$}}
; CHECK-NEXT: return $pop[[NUM]]{{$}}
define i32 @call_i32_unary(i32 %a) {
  %r = call i32 @i32_unary(i32 %a)
  ret i32 %r
}

; CHECK-LABEL: call_i32_binary:
; CHECK-NEXT: .param i32, i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: {{^}} i32.call $push[[NUM:[0-9]+]]=, i32_binary@FUNCTION, $0, $1{{$}}
; CHECK-NEXT: return $pop[[NUM]]{{$}}
define i32 @call_i32_binary(i32 %a, i32 %b) {
  %r = call i32 @i32_binary(i32 %a, i32 %b)
  ret i32 %r
}

; CHECK-LABEL: call_indirect_void:
; CHECK-NEXT: .param i32{{$}}
; CHECK-NEXT: {{^}} call_indirect $0{{$}}
; CHECK-NEXT: return{{$}}
define void @call_indirect_void(void ()* %callee) {
  call void %callee()
  ret void
}

; CHECK-LABEL: call_indirect_i32:
; CHECK-NEXT: .param i32{{$}}
; CHECK-NEXT: .result i32{{$}}
; CHECK-NEXT: {{^}} i32.call_indirect $push[[NUM:[0-9]+]]=, $0{{$}}
; CHECK-NEXT: return $pop[[NUM]]{{$}}
define i32 @call_indirect_i32(i32 ()* %callee) {
  %t = call i32 %callee()
  ret i32 %t
}

; CHECK-LABEL: call_indirect_arg:
; CHECK-NEXT: .param i32, i32{{$}}
; CHECK-NEXT: {{^}} call_indirect $1, $0{{$}}
; CHECK-NEXT: return{{$}}
define void @call_indirect_arg(void (i32)* %callee, i32 %arg) {
  call void %callee(i32 %arg)
  ret void
}

; CHECK-LABEL: call_indirect_arg_2:
; CHECK-NEXT: .param i32, i32, i32{{$}}
; CHECK-NEXT: {{^}} i32.call_indirect $drop=, $1, $2, $0{{$}}
; CHECK-NEXT: return{{$}}
define void @call_indirect_arg_2(i32 (i32, i32)* %callee, i32 %arg, i32 %arg2) {
  call i32 %callee(i32 %arg, i32 %arg2)
  ret void
}

; CHECK-LABEL: tail_call_void_nullary:
; CHECK-NEXT: {{^}} call void_nullary@FUNCTION{{$}}
; CHECK-NEXT: return{{$}}
define void @tail_call_void_nullary() {
  tail call void @void_nullary()
  ret void
}

; CHECK-LABEL: fastcc_tail_call_void_nullary:
; CHECK-NEXT: {{^}} call void_nullary@FUNCTION{{$}}
; CHECK-NEXT: return{{$}}
define void @fastcc_tail_call_void_nullary() {
  tail call fastcc void @void_nullary()
  ret void
}

; CHECK-LABEL: coldcc_tail_call_void_nullary:
; CHECK-NEXT: {{^}} call void_nullary@FUNCTION{{$}}
; CHECK-NEXT: return{{$}}
define void @coldcc_tail_call_void_nullary() {
  tail call coldcc void @void_nullary()
  ret void
}

; TODO: test the following:
;  - More argument combinations.
;  - Tail call.
;  - Interesting returns (struct, multiple).
;  - Vararg.