llvm/test/Transforms/JumpThreading/freeze.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=jump-threading -S < %s | FileCheck %s

declare i32 @f1()
declare i32 @f2()
declare void @f3()

define i32 @test1(i1 %cond) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
; CHECK:       T2:
; CHECK-NEXT:    [[V1:%.*]] = call i32 @f1()
; CHECK-NEXT:    call void @f3()
; CHECK-NEXT:    ret i32 [[V1]]
; CHECK:       F2:
; CHECK-NEXT:    [[V2:%.*]] = call i32 @f2()
; CHECK-NEXT:    ret i32 [[V2]]
;
  br i1 %cond, label %T1, label %F1

T1:
  %v1 = call i32 @f1()
  br label %Merge

F1:
  %v2 = call i32 @f2()
  br label %Merge

Merge:
  %A = phi i1 [true, %T1], [false, %F1]
  %B = phi i32 [%v1, %T1], [%v2, %F1]
  %A.fr = freeze i1 %A
  br i1 %A.fr, label %T2, label %F2

T2:
  call void @f3()
  ret i32 %B

F2:
  ret i32 %B
}

define i32 @test1_cast(i1 %cond) {
; CHECK-LABEL: @test1_cast(
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
; CHECK:       T2:
; CHECK-NEXT:    [[V1:%.*]] = call i32 @f1()
; CHECK-NEXT:    call void @f3()
; CHECK-NEXT:    ret i32 [[V1]]
; CHECK:       F2:
; CHECK-NEXT:    [[V2:%.*]] = call i32 @f2()
; CHECK-NEXT:    [[A:%.*]] = trunc i32 0 to i1
; CHECK-NEXT:    ret i32 [[V2]]
;
  br i1 %cond, label %T1, label %F1

T1:
  %v1 = call i32 @f1()
  br label %Merge

F1:
  %v2 = call i32 @f2()
  br label %Merge

Merge:
  %A0 = phi i32 [1, %T1], [0, %F1]
  %B = phi i32 [%v1, %T1], [%v2, %F1]
  %A = trunc i32 %A0 to i1
  %A.fr = freeze i1 %A
  br i1 %A.fr, label %T2, label %F2

T2:
  call void @f3()
  ret i32 %B

F2:
  ret i32 %B
}

define i32 @test1_cast2(i1 %cond) {
; CHECK-LABEL: @test1_cast2(
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
; CHECK:       T2:
; CHECK-NEXT:    [[V1:%.*]] = call i32 @f1()
; CHECK-NEXT:    call void @f3()
; CHECK-NEXT:    ret i32 [[V1]]
; CHECK:       F2:
; CHECK-NEXT:    [[V2:%.*]] = call i32 @f2()
; CHECK-NEXT:    [[A0_FR:%.*]] = freeze i32 0
; CHECK-NEXT:    ret i32 [[V2]]
;
  br i1 %cond, label %T1, label %F1

T1:
  %v1 = call i32 @f1()
  br label %Merge

F1:
  %v2 = call i32 @f2()
  br label %Merge

Merge:
  %A0 = phi i32 [1, %T1], [0, %F1]
  %B = phi i32 [%v1, %T1], [%v2, %F1]
  %A0.fr = freeze i32 %A0
  %A.fr = trunc i32 %A0.fr to i1
  br i1 %A.fr, label %T2, label %F2

T2:
  call void @f3()
  ret i32 %B

F2:
  ret i32 %B
}

define i32 @test1_undef(i1 %cond) {
; CHECK-LABEL: @test1_undef(
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[T2:%.*]], label [[F2:%.*]]
; CHECK:       T2:
; CHECK-NEXT:    [[V1:%.*]] = call i32 @f1()
; CHECK-NEXT:    call void @f3()
; CHECK-NEXT:    ret i32 [[V1]]
; CHECK:       F2:
; CHECK-NEXT:    [[V2:%.*]] = call i32 @f2()
; CHECK-NEXT:    ret i32 [[V2]]
;
  br i1 %cond, label %T1, label %F1

T1:
  %v1 = call i32 @f1()
  br label %Merge

F1:
  %v2 = call i32 @f2()
  br label %Merge

Merge:
  %A = phi i1 [true, %T1], [undef, %F1]
  %B = phi i32 [%v1, %T1], [%v2, %F1]
  %A.fr = freeze i1 %A
  br i1 %A.fr, label %T2, label %F2

T2:
  call void @f3()
  ret i32 %B

F2:
  ret i32 %B
}

define i32 @test2(i1 %cond, i1 %cond2) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[MERGE_THREAD:%.*]], label [[MERGE:%.*]]
; CHECK:       Merge.thread:
; CHECK-NEXT:    [[V1:%.*]] = call i32 @f1()
; CHECK-NEXT:    br label [[T2:%.*]]
; CHECK:       Merge:
; CHECK-NEXT:    [[V2:%.*]] = call i32 @f2()
; CHECK-NEXT:    [[A_FR:%.*]] = freeze i1 [[COND2:%.*]]
; CHECK-NEXT:    br i1 [[A_FR]], label [[T2]], label [[F2:%.*]]
; CHECK:       T2:
; CHECK-NEXT:    [[B4:%.*]] = phi i32 [ [[V1]], [[MERGE_THREAD]] ], [ [[V2]], [[MERGE]] ]
; CHECK-NEXT:    call void @f3()
; CHECK-NEXT:    ret i32 [[B4]]
; CHECK:       F2:
; CHECK-NEXT:    ret i32 [[V2]]
;
  br i1 %cond, label %T1, label %F1

T1:
  %v1 = call i32 @f1()
  br label %Merge

F1:
  %v2 = call i32 @f2()
  br label %Merge

Merge:
  %A = phi i1 [true, %T1], [%cond2, %F1]
  %B = phi i32 [%v1, %T1], [%v2, %F1]
  %A.fr = freeze i1 %A
  br i1 %A.fr, label %T2, label %F2

T2:
  call void @f3()
  ret i32 %B

F2:
  ret i32 %B
}

define i32 @freeze_known_predicate(i1 %cond) {
; CHECK-LABEL: @freeze_known_predicate(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF:%.*]], label [[ELSE2:%.*]]
; CHECK:       if:
; CHECK-NEXT:    br label [[ELSE2]]
; CHECK:       else2:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 1, [[IF]] ], [ 2, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 1
;
entry:
  br i1 %cond, label %if, label %join

if:
  br label %join

join:
  %phi = phi i32 [ 1, %if ], [ 2, %entry ]
  %cmp = icmp eq i32 %phi, 0
  %cmp.fr = freeze i1 %cmp
  br i1 %cmp.fr, label %if2, label %else2

if2:
  ret i32 0

else2:
  ret i32 1
}

define i32 @freeze_known_predicate_barrier(i1 %cond) {
; CHECK-LABEL: @freeze_known_predicate_barrier(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF:%.*]], label [[ELSE2:%.*]]
; CHECK:       if:
; CHECK-NEXT:    br label [[ELSE2]]
; CHECK:       else2:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 1, [[IF]] ], [ 2, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[PHI]], 0
; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @f1()
; CHECK-NEXT:    ret i32 1
;
entry:
  br i1 %cond, label %if, label %join

if:
  br label %join

join:
  %phi = phi i32 [ 1, %if ], [ 2, %entry ]
  %cmp = icmp eq i32 %phi, 0
  %cmp.fr = freeze i1 %cmp
  call i32 @f1()
  br i1 %cmp.fr, label %if2, label %else2

if2:
  ret i32 0

else2:
  ret i32 1
}