xref: /aosp_15_r20/external/llvm/test/CodeGen/AArch64/arm64-fast-isel-br.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

; RUN: llc -O0 -fast-isel-abort=1 -mtriple=arm64-apple-darwin -mcpu=cyclone -verify-machineinstrs < %s | FileCheck %s

define void @branch1() nounwind uwtable ssp {
  %x = alloca i32, align 4
  store i32 0, i32* %x, align 4
  %1 = load i32, i32* %x, align 4
  %2 = icmp ne i32 %1, 0
  br i1 %2, label %3, label %4

; <label>:3                                       ; preds = %0
  br label %4

; <label>:4                                       ; preds = %3, %0
  ret void
}

define void @branch2() nounwind uwtable ssp {
  %1 = alloca i32, align 4
  %x = alloca i32, align 4
  %y = alloca i32, align 4
  %z = alloca i32, align 4
  store i32 0, i32* %1
  store i32 1, i32* %y, align 4
  store i32 1, i32* %x, align 4
  store i32 0, i32* %z, align 4
  %2 = load i32, i32* %x, align 4
  %3 = icmp ne i32 %2, 0
  br i1 %3, label %4, label %5

; <label>:4                                       ; preds = %0
  store i32 0, i32* %1
  br label %14

; <label>:5                                       ; preds = %0
  %6 = load i32, i32* %y, align 4
  %7 = icmp ne i32 %6, 0
  br i1 %7, label %8, label %13

; <label>:8                                       ; preds = %5
  %9 = load i32, i32* %z, align 4
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %12

; <label>:11                                      ; preds = %8
  store i32 1, i32* %1
  br label %14

; <label>:12                                      ; preds = %8
  store i32 0, i32* %1
  br label %14

; <label>:13                                      ; preds = %5
  br label %14

; <label>:14                                      ; preds = %4, %11, %12, %13
  %15 = load i32, i32* %1
  ret void
}

define void @true_() nounwind uwtable ssp {
; CHECK: @true_
; CHECK: b LBB2_1
  br i1 true, label %1, label %2

; <label>:1
; CHECK: LBB2_1
  br label %2

; <label>:2
  ret void
}

define void @false_() nounwind uwtable ssp {
; CHECK: @false_
; CHECK: b LBB3_2
  br i1 false, label %1, label %2

; <label>:1
  br label %2

; <label>:2
; CHECK: LBB3_2
  ret void
}

define zeroext i8 @trunc_(i8 zeroext %a, i16 zeroext %b, i32 %c, i64 %d) {
entry:
  %a.addr = alloca i8, align 1
  %b.addr = alloca i16, align 2
  %c.addr = alloca i32, align 4
  %d.addr = alloca i64, align 8
  store i8 %a, i8* %a.addr, align 1
  store i16 %b, i16* %b.addr, align 2
  store i32 %c, i32* %c.addr, align 4
  store i64 %d, i64* %d.addr, align 8
  %0 = load i16, i16* %b.addr, align 2
; CHECK: tbz w0, #0, LBB4_2
  %conv = trunc i16 %0 to i1
  br i1 %conv, label %if.then, label %if.end

if.then:                                          ; preds = %entry
  call void @foo1()
  br label %if.end

if.end:                                           ; preds = %if.then, %entry
  %1 = load i32, i32* %c.addr, align 4
; CHECK: tbz w{{[0-9]+}}, #0, LBB4_4
  %conv1 = trunc i32 %1 to i1
  br i1 %conv1, label %if.then3, label %if.end4

if.then3:                                         ; preds = %if.end
  call void @foo1()
  br label %if.end4

if.end4:                                          ; preds = %if.then3, %if.end
  %2 = load i64, i64* %d.addr, align 8
; CHECK: tbz w{{[0-9]+}}, #0, LBB4_6
  %conv5 = trunc i64 %2 to i1
  br i1 %conv5, label %if.then7, label %if.end8

if.then7:                                         ; preds = %if.end4
  call void @foo1()
  br label %if.end8

if.end8:                                          ; preds = %if.then7, %if.end4
  %3 = load i8, i8* %a.addr, align 1
  ret i8 %3
}

declare void @foo1()

; rdar://15174028
define i32 @trunc64(i64 %foo) nounwind {
; CHECK: trunc64
; CHECK: and  [[REG1:x[0-9]+]], x0, #0x1
; CHECK: mov  x[[REG2:[0-9]+]], [[REG1]]
; CHECK: tbz w[[REG2]], #0, LBB5_2
  %a = and i64 %foo, 1
  %b = trunc i64 %a to i1
  br i1 %b, label %if.then, label %if.else

if.then:
  ret i32 1

if.else:
  ret i32 0
}