llvm-project/llvm/test/CodeGen/X86/tailcall-64.ll

; RUN: llc -mtriple=x86_64-apple-macosx -mcpu=core2 < %s | FileCheck %s

declare i64 @testi()

define i64 @test_trivial() {
 %A = tail call i64 @testi()
 ret i64 %A
}
; CHECK: test_trivial:
; CHECK: jmp	_testi                  ## TAILCALL


define i64 @test_noop_bitcast() {
 %A = tail call i64 @testi()
 %B = bitcast i64 %A to i64
 ret i64 %B
}
; CHECK: test_noop_bitcast:
; CHECK: jmp	_testi                  ## TAILCALL


; Tail call shouldn't be blocked by no-op inttoptr.
define i8* @test_inttoptr() {
  %A = tail call i64 @testi()
  %B = inttoptr i64 %A to i8*
  ret i8* %B
}

; CHECK: test_inttoptr:
; CHECK: jmp	_testi                  ## TAILCALL


declare <4 x float> @testv()

define <4 x i32> @test_vectorbitcast() {
  %A = tail call <4 x float> @testv()
  %B = bitcast <4 x float> %A to <4 x i32>
  ret <4 x i32> %B
}
; CHECK: test_vectorbitcast:
; CHECK: jmp	_testv                  ## TAILCALL


declare { i64, i64 } @testp()

define {i64, i64} @test_pair_trivial() {
  %A = tail call { i64, i64} @testp()
  ret { i64, i64} %A
}
; CHECK: test_pair_trivial:
; CHECK: jmp	_testp                  ## TAILCALL



define {i64, i64} @test_pair_trivial_extract() {
  %A = tail call { i64, i64} @testp()
  %x = extractvalue { i64, i64} %A, 0
  %y = extractvalue { i64, i64} %A, 1
  
  %b = insertvalue {i64, i64} undef, i64 %x, 0
  %c = insertvalue {i64, i64} %b, i64 %y, 1
  
  ret { i64, i64} %c
}

; CHECK: test_pair_trivial_extract:
; CHECK: jmp	_testp                  ## TAILCALL

define {i8*, i64} @test_pair_conv_extract() {
  %A = tail call { i64, i64} @testp()
  %x = extractvalue { i64, i64} %A, 0
  %y = extractvalue { i64, i64} %A, 1
  
  %x1 = inttoptr i64 %x to i8*
  
  %b = insertvalue {i8*, i64} undef, i8* %x1, 0
  %c = insertvalue {i8*, i64} %b, i64 %y, 1
  
  ret { i8*, i64} %c
}

; CHECK: test_pair_conv_extract:
; CHECK: jmp	_testp                  ## TAILCALL



; PR13006
define { i64, i64 } @crash(i8* %this) {
  %c = tail call { i64, i64 } @testp()
  %mrv7 = insertvalue { i64, i64 } %c, i64 undef, 1
  ret { i64, i64 } %mrv7
}

; Check that we can fold an indexed load into a tail call instruction.
; CHECK: fold_indexed_load
; CHECK: leaq (%rsi,%rsi,4), %[[RAX:r..]]
; CHECK: jmpq *16(%{{r..}},%[[RAX]],8)  # TAILCALL
%struct.funcs = type { i32 (i8*, i32*, i32)*, i32 (i8*)*, i32 (i8*)*, i32 (i8*, i32)*, i32 }
@func_table = external global [0 x %struct.funcs]
define void @fold_indexed_load(i8* %mbstr, i64 %idxprom) nounwind uwtable ssp {
entry:
  %dsplen = getelementptr inbounds [0 x %struct.funcs]* @func_table, i64 0, i64 %idxprom, i32 2
  %x1 = load i32 (i8*)** %dsplen, align 8
  %call = tail call i32 %x1(i8* %mbstr) nounwind
  ret void
}

; <rdar://problem/12282281> Fold an indexed load into the tail call instruction.
; Calling a varargs function with 6 arguments requires 7 registers (%al is the
; vector count for varargs functions). This leaves %r11 as the only available
; scratch register.
;
; It is not possible to fold an indexed load into TCRETURNmi64 in that case.
;
; typedef int (*funcptr)(void*, ...);
; extern const funcptr funcs[];
; int f(int n) {
;   return funcs[n](0, 0, 0, 0, 0, 0);
; }
;
; CHECK: rdar12282281
; CHECK: jmpq *%r11 # TAILCALL
@funcs = external constant [0 x i32 (i8*, ...)*]

define i32 @rdar12282281(i32 %n) nounwind uwtable ssp {
entry:
  %idxprom = sext i32 %n to i64
  %arrayidx = getelementptr inbounds [0 x i32 (i8*, ...)*]* @funcs, i64 0, i64 %idxprom
  %0 = load i32 (i8*, ...)** %arrayidx, align 8
  %call = tail call i32 (i8*, ...)* %0(i8* null, i32 0, i32 0, i32 0, i32 0, i32 0) nounwind
  ret i32 %call
}

define x86_fp80 @fp80_call(x86_fp80 %x) nounwind  {
entry:
; CHECK: fp80_call:
; CHECK: jmp _fp80_callee
  %call = tail call x86_fp80 @fp80_callee(x86_fp80 %x) nounwind
  ret x86_fp80 %call
}

declare x86_fp80 @fp80_callee(x86_fp80)

; rdar://12229511
define x86_fp80 @trunc_fp80(x86_fp80 %x) nounwind  {
entry:
; CHECK: trunc_fp80
; CHECK: callq _trunc
; CHECK-NOT: jmp _trunc
; CHECK: ret
  %conv = fptrunc x86_fp80 %x to double
  %call = tail call double @trunc(double %conv) nounwind readnone
  %conv1 = fpext double %call to x86_fp80
  ret x86_fp80 %conv1
}

declare double @trunc(double) nounwind readnone