llvm/test/Transforms/InstCombine/fold-icmp-without-constant-into-phi.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

define i1 @test(i1 %cond, i64 %left, i64 %right) {
; CHECK-LABEL: define i1 @test(
; CHECK-SAME: i1 [[COND:%.*]], i64 [[LEFT:%.*]], i64 [[RIGHT:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    br i1 [[COND]], label %[[COND_TRUE:.*]], label %[[COND_FALSE:.*]]
; CHECK:       [[COND_TRUE]]:
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i64 [[RIGHT]], [[LEFT]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[END:.*]], label %[[COND_FALSE]]
; CHECK:       [[COND_FALSE]]:
; CHECK-NEXT:    br label %[[END]]
; CHECK:       [[END]]:
; CHECK-NEXT:    ret i1 false
;
start:
  br i1 %cond, label %cond.true, label %cond.false

cond.true:
  %cmp = icmp sgt i64 %right, %left
  br i1 %cmp, label %end, label %cond.false

cond.false:
  %left_or_right = phi i64 [ %left, %start ], [ %right, %cond.true ]
  %false = icmp sgt i64 %left_or_right, %left
  br label %end

end:
  %result = phi i1 [ false, %cond.true ], [ %false, %cond.false ]
  ret i1 %result
}

define i1 @test_commuted(i1 %cond, i64 %left, i64 %right) {
; CHECK-LABEL: define i1 @test_commuted(
; CHECK-SAME: i1 [[COND:%.*]], i64 [[LEFT:%.*]], i64 [[RIGHT:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    br i1 [[COND]], label %[[COND_TRUE:.*]], label %[[COND_FALSE:.*]]
; CHECK:       [[COND_TRUE]]:
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i64 [[RIGHT]], [[LEFT]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[END:.*]], label %[[COND_FALSE]]
; CHECK:       [[COND_FALSE]]:
; CHECK-NEXT:    br label %[[END]]
; CHECK:       [[END]]:
; CHECK-NEXT:    ret i1 false
;
start:
  br i1 %cond, label %cond.true, label %cond.false

cond.true:
  %cmp = icmp sgt i64 %right, %left
  br i1 %cmp, label %end, label %cond.false

cond.false:
  %left_or_right = phi i64 [ %left, %start ], [ %right, %cond.true ]
  %false = icmp slt i64 %left, %left_or_right
  br label %end

end:
  %result = phi i1 [ false, %cond.true ], [ %false, %cond.false ]
  ret i1 %result
}

define i1 @test_with_wrong_icmp(i1 %cond, i64 %left, i64 %right) {
; CHECK-LABEL: define i1 @test_with_wrong_icmp(
; CHECK-SAME: i1 [[COND:%.*]], i64 [[LEFT:%.*]], i64 [[RIGHT:%.*]]) {
; CHECK-NEXT:  [[START:.*]]:
; CHECK-NEXT:    br i1 [[COND]], label %[[COND_TRUE:.*]], label %[[COND_FALSE:.*]]
; CHECK:       [[COND_TRUE]]:
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i64 [[RIGHT]], [[LEFT]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[END:.*]], label %[[COND_FALSE]]
; CHECK:       [[COND_FALSE]]:
; CHECK-NEXT:    [[LEFT_OR_RIGHT:%.*]] = phi i64 [ [[LEFT]], %[[START]] ], [ [[RIGHT]], %[[COND_TRUE]] ]
; CHECK-NEXT:    [[FALSE:%.*]] = icmp sge i64 [[LEFT_OR_RIGHT]], [[LEFT]]
; CHECK-NEXT:    br label %[[END]]
; CHECK:       [[END]]:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i1 [ false, %[[COND_TRUE]] ], [ [[FALSE]], %[[COND_FALSE]] ]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  br i1 %cond, label %cond.true, label %cond.false

cond.true:
  %cmp = icmp sgt i64 %right, %left
  br i1 %cmp, label %end, label %cond.false

cond.false:
  %left_or_right = phi i64 [ %left, %start ], [ %right, %cond.true ]
  %false = icmp sge i64 %left_or_right, %left
  br label %end

end:
  %result = phi i1 [ false, %cond.true ], [ %false, %cond.false ]
  ret i1 %result
}

define i1 @test_with_unfoldable_phi(i1 %cond, i64 %left, i64 %right) {
; CHECK-LABEL: define i1 @test_with_unfoldable_phi(
; CHECK-SAME: i1 [[COND:%.*]], i64 [[LEFT:%.*]], i64 [[RIGHT:%.*]]) {
; CHECK-NEXT:  [[START:.*]]:
; CHECK-NEXT:    br i1 [[COND]], label %[[COND_TRUE:.*]], label %[[COND_FALSE:.*]]
; CHECK:       [[COND_TRUE]]:
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i64 [[RIGHT]], [[LEFT]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[END:.*]], label %[[COND_FALSE]]
; CHECK:       [[COND_FALSE]]:
; CHECK-NEXT:    [[LEFT_OR_RIGHT:%.*]] = phi i64 [ [[LEFT]], %[[START]] ], [ [[RIGHT]], %[[COND_TRUE]] ]
; CHECK-NEXT:    [[FALSE:%.*]] = icmp sgt i64 [[LEFT_OR_RIGHT]], [[LEFT]]
; CHECK-NEXT:    br label %[[END]]
; CHECK:       [[END]]:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i1 [ false, %[[COND_TRUE]] ], [ [[FALSE]], %[[COND_FALSE]] ]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  br i1 %cond, label %cond.true, label %cond.false

cond.true:
  %cmp = icmp slt i64 %right, %left         ; slt instead of sgt here
  br i1 %cmp, label %end, label %cond.false

cond.false:
  %left_or_right = phi i64 [ %left, %start ], [ %right, %cond.true ]
  %false = icmp sgt i64 %left_or_right, %left
  br label %end

end:
  %result = phi i1 [ false, %cond.true ], [ %false, %cond.false ]
  ret i1 %result
}

define i1 @test_which_optimizes_to_select(i1 %cond, i64 %left, i64 %right) {
; CHECK-LABEL: define i1 @test_which_optimizes_to_select(
; CHECK-SAME: i1 [[COND:%.*]], i64 [[LEFT:%.*]], i64 [[RIGHT:%.*]]) {
; CHECK-NEXT:  [[START:.*:]]
; CHECK-NEXT:    br i1 [[COND]], label %[[COND_TRUE:.*]], label %[[COND_FALSE:.*]]
; CHECK:       [[COND_TRUE]]:
; CHECK-NEXT:    [[CMP_NOT:%.*]] = icmp sgt i64 [[RIGHT]], [[LEFT]]
; CHECK-NEXT:    br i1 [[CMP_NOT]], label %[[COND_FALSE]], label %[[END:.*]]
; CHECK:       [[COND_FALSE]]:
; CHECK-NEXT:    br label %[[END]]
; CHECK:       [[END]]:
; CHECK-NEXT:    [[RESULT:%.*]] = phi i1 [ false, %[[COND_TRUE]] ], [ [[COND]], %[[COND_FALSE]] ]
; CHECK-NEXT:    ret i1 [[RESULT]]
;
start:
  br i1 %cond, label %cond.true, label %cond.false

cond.true:
  %cmp = icmp sle i64 %right, %left
  br i1 %cmp, label %end, label %cond.false

cond.false:
  %left_or_right = phi i64 [ %left, %start ], [ %right, %cond.true ]
  %false = icmp sgt i64 %left_or_right, %left
  br label %end

end:
  %result = phi i1 [ false, %cond.true ], [ %false, %cond.false ]
  ret i1 %result
}