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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers | FileCheck %s
; Test that the "returned" attribute is optimized effectively.
target triple = "wasm32-unknown-unknown"
%class.Apple = type { i8 }
declare noalias ptr @_Znwm(i32)
declare ptr @_ZN5AppleC1Ev(ptr returned)
define ptr @_Z3foov() {
; CHECK-LABEL: _Z3foov:
; CHECK: .functype _Z3foov () -> (i32)
; CHECK-NEXT: # %bb.0: # %entry
; CHECK-NEXT: i32.const $push0=, 1
; CHECK-NEXT: call $push1=, _Znwm, $pop0
; CHECK-NEXT: call $push2=, _ZN5AppleC1Ev, $pop1
; CHECK-NEXT: return $pop2
entry:
%call = tail call noalias ptr @_Znwm(i32 1)
%call1 = tail call ptr @_ZN5AppleC1Ev(ptr %call)
ret ptr %call
}
declare ptr @memcpy(ptr returned, ptr, i32)
define ptr @_Z3barPvS_l(ptr %p, ptr %s, i32 %n) {
; CHECK-LABEL: _Z3barPvS_l:
; CHECK: .functype _Z3barPvS_l (i32, i32, i32) -> (i32)
; CHECK-NEXT: # %bb.0: # %entry
; CHECK-NEXT: call $push0=, memcpy, $0, $1, $2
; CHECK-NEXT: return $pop0
entry:
%call = tail call ptr @memcpy(ptr %p, ptr %s, i32 %n)
ret ptr %p
}
; Test that the optimization isn't performed on constant arguments.
@global = external global i32
@addr = global ptr @global
define void @test_constant_arg() {
; CHECK-LABEL: test_constant_arg:
; CHECK: .functype test_constant_arg () -> ()
; CHECK-NEXT: # %bb.0:
; CHECK-NEXT: i32.const $push0=, global
; CHECK-NEXT: call $drop=, returns_arg, $pop0
; CHECK-NEXT: return
%call = call ptr @returns_arg(ptr @global)
ret void
}
declare ptr @returns_arg(ptr returned)
; Test that the optimization isn't performed on arguments without the
; "returned" attribute.
declare i32 @do_something(i32 returned, i32, double)
declare void @do_something_with_i32(i32)
declare void @do_something_with_double(double)
define void @test_other_skipped(i32 %a, i32 %b, double %c) {
; CHECK-LABEL: test_other_skipped:
; CHECK: .functype test_other_skipped (i32, i32, f64) -> ()
; CHECK-NEXT: # %bb.0:
; CHECK-NEXT: call $drop=, do_something, $0, $1, $2
; CHECK-NEXT: call do_something_with_i32, $1
; CHECK-NEXT: call do_something_with_double, $2
; CHECK-NEXT: return
%call = call i32 @do_something(i32 %a, i32 %b, double %c)
call void @do_something_with_i32(i32 %b)
call void @do_something_with_double(double %c)
ret void
}
; Test that the optimization is performed on arguments other than the first.
declare i32 @do_something_else(i32, i32 returned)
define i32 @test_second_arg(i32 %a, i32 %b) {
; CHECK-LABEL: test_second_arg:
; CHECK: .functype test_second_arg (i32, i32) -> (i32)
; CHECK-NEXT: # %bb.0:
; CHECK-NEXT: call $push0=, do_something_else, $0, $1
; CHECK-NEXT: return $pop0
%call = call i32 @do_something_else(i32 %a, i32 %b)
ret i32 %b
}
define void @test() {
; CHECK-LABEL: test:
; CHECK: .functype test () -> ()
; CHECK-NEXT: # %bb.0: # %entry
; CHECK-NEXT: global.get $push0=, __stack_pointer
; CHECK-NEXT: i32.const $push1=, 16
; CHECK-NEXT: i32.sub $push7=, $pop0, $pop1
; CHECK-NEXT: local.tee $push6=, $0=, $pop7
; CHECK-NEXT: global.set __stack_pointer, $pop6
; CHECK-NEXT: i32.const $push4=, 12
; CHECK-NEXT: i32.add $push5=, $0, $pop4
; CHECK-NEXT: call $drop=, returns_arg, $pop5
; CHECK-NEXT: i32.const $push2=, 16
; CHECK-NEXT: i32.add $push3=, $0, $pop2
; CHECK-NEXT: global.set __stack_pointer, $pop3
; CHECK-NEXT: return
entry:
%a = alloca i32
call void @llvm.lifetime.start.p0(ptr %a)
%ret = call ptr @returns_arg(ptr %a)
call void @llvm.lifetime.end.p0(ptr %a)
ret void
}
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