llvm/test/CodeGen/RISCV/shrinkwrap-save-restore-fixed-reg.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv64 -mattr=+save-restore,+reserve-x5 -verify-machineinstrs < %s \
; RUN:   | FileCheck %s

; This test verifies that the shrink-wrap pass does not crash when the save
; point reaches the entry block (which has no predecessors) while trying to find
; a cheaper save point via FindIDom.

@a = global i32 0, align 4

define signext i32 @shrinkwrap_entry_no_preds() {
; CHECK-LABEL: shrinkwrap_entry_no_preds:
; CHECK:       # %bb.0: # %entry
; CHECK-NEXT:    call t0, __riscv_save_0
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    .cfi_offset ra, -8
; CHECK-NEXT:    lui a0, %hi(a)
; CHECK-NEXT:    lw a0, %lo(a)(a0)
; CHECK-NEXT:    beqz a0, .LBB0_2
; CHECK-NEXT:  # %bb.1: # %if.then
; CHECK-NEXT:    call b
; CHECK-NEXT:  .LBB0_2: # %if.end
; CHECK-NEXT:    li a0, 0
; CHECK-NEXT:    tail __riscv_restore_0
entry:
  %0 = load i32, ptr @a, align 4
  %tobool.not = icmp eq i32 %0, 0
  br i1 %tobool.not, label %if.end, label %if.then

if.then:
  tail call void @b()
  br label %if.end

if.end:
  ret i32 0
}

declare void @b()