shrinkwrap-callbr.ll
1.79 KB
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -enable-shrink-wrap=true | FileCheck %s
;; Ensure that shrink-wrapping understands that INLINEASM_BR may exit
;; the block before the end, and you cannot simply place stack
;; adjustment at the end of that block.
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare i32 @fn()
; Function Attrs: uwtable
define i32 @test1(i32 %v) {
; CHECK-LABEL: test1:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq %rax
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: testl %edi, %edi
; CHECK-NEXT: je .LBB0_3
; CHECK-NEXT: # %bb.1: # %if.end
; CHECK-NEXT: callq fn
; CHECK-NEXT: #APP
; CHECK-NEXT: # jump to .Ltmp0
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: # %bb.2: # %return
; CHECK-NEXT: movl $4, %eax
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: retq
; CHECK-NEXT: .LBB0_3: # %ret0
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: retq
; CHECK-NEXT: .Ltmp0: # Block address taken
; CHECK-NEXT: .LBB0_4: # %two
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: popq %rax
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: jmp fn # TAILCALL
entry:
%tobool = icmp eq i32 %v, 0
br i1 %tobool, label %ret0, label %if.end
ret0:
ret i32 0
if.end:
%call = tail call i32 @fn()
callbr void asm sideeffect "# jump to $0", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@test1, %two))
to label %return [label %two]
two:
%call1 = tail call i32 @fn()
br label %return
return:
%retval.1 = phi i32 [ %call1, %two ], [ 4, %if.end ]
ret i32 %retval.1
}