--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
+
+target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+
+declare void @use(i16)
+declare void @llvm.assume(i1)
+
+define void @test_monotonic_ptr_iv_inc_1_eq_to_uge(i8 %len.n, i16 %a) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_eq_to_uge(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[LEN:%.*]] = zext i8 [[LEN_N:%.*]] to i16
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp uge i16 [[LEN]], [[A:%.*]]
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[IV:%.*]] = phi i16 [ 0, [[LOOP_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C:%.*]] = icmp eq i16 [[IV]], [[LEN]]
+; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[T_1:%.*]] = icmp uge i16 [[IV]], 0
+; CHECK-NEXT: [[T_2:%.*]] = icmp ult i16 [[IV]], [[A]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(i16 [[IV]])
+; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i16 [[IV]], 1
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %len = zext i8 %len.n to i16
+ %len.neg = icmp uge i16 %len, %a
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %iv = phi i16 [ 0, %loop.ph ], [ %iv.next, %loop.latch ]
+ %c = icmp eq i16 %iv, %len
+ br i1 %c, label %exit, label %for.body
+
+for.body:
+ %t.1 = icmp uge i16 %iv, 0
+ %t.2 = icmp ult i16 %iv, %a
+ %and = and i1 %t.1, %t.2
+ br i1 %and, label %loop.latch, label %exit
+
+loop.latch:
+ call void @use(i16 %iv)
+ %iv.next = add nuw nsw i16 %iv, 1
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+define void @test_remove_check_with_incrementing_integer_induction(i8 %len.n, i16 %a) {
+; CHECK-LABEL: @test_remove_check_with_incrementing_integer_induction(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[LEN:%.*]] = zext i8 [[LEN_N:%.*]] to i16
+; CHECK-NEXT: [[LEN_NEG_NOT:%.*]] = icmp ult i16 [[LEN]], [[A:%.*]]
+; CHECK-NEXT: br i1 [[LEN_NEG_NOT]], label [[LOOP_HEADER:%.*]], label [[EXIT:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[IV:%.*]] = phi i16 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[C:%.*]] = icmp ne i16 [[IV]], [[LEN]]
+; CHECK-NEXT: [[T_2:%.*]] = icmp ult i16 [[IV]], [[A]]
+; CHECK-NEXT: [[OR_COND:%.*]] = and i1 [[C]], [[T_2]]
+; CHECK-NEXT: br i1 [[OR_COND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(i16 [[IV]])
+; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i16 [[IV]], 1
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %len = zext i8 %len.n to i16
+ %len.neg.not = icmp ult i16 %len, %a
+ br i1 %len.neg.not, label %loop.header, label %exit
+
+loop.header: ; preds = %entry, %loop.latch
+ %iv = phi i16 [ %iv.next, %loop.latch ], [ 0, %entry ]
+ %c = icmp ne i16 %iv, %len
+ %t.2 = icmp ult i16 %iv, %a
+ %or.cond = and i1 %c, %t.2
+ br i1 %or.cond, label %loop.latch, label %exit
+
+loop.latch: ; preds = %loop.header
+ call void @use(i16 %iv)
+ %iv.next = add nuw nsw i16 %iv, 1
+ br label %loop.header
+
+exit: ; preds = %loop.header, %entry
+ ret void
+}
+
+define void @test_monotonic_ptr_iv_inc_2_eq_to_uge(i8 %len.n, i16 %a) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_inc_2_eq_to_uge(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[LEN:%.*]] = zext i8 [[LEN_N:%.*]] to i16
+; CHECK-NEXT: [[LEN_LT:%.*]] = icmp ult i16 [[LEN]], [[A:%.*]]
+; CHECK-NEXT: br i1 [[LEN_LT]], label [[LOOP_PH:%.*]], label [[EXIT:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[IV:%.*]] = phi i16 [ 0, [[LOOP_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C:%.*]] = icmp eq i16 [[IV]], [[LEN]]
+; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[T_1:%.*]] = icmp uge i16 [[IV]], 0
+; CHECK-NEXT: [[T_2:%.*]] = icmp ult i16 [[IV]], [[A]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(i16 [[IV]])
+; CHECK-NEXT: [[IV_NEXT]] = add nuw i16 [[IV]], 2
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %len = zext i8 %len.n to i16
+ %len.lt = icmp ult i16 %len, %a
+ br i1 %len.lt, label %loop.ph, label %exit
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %iv = phi i16 [ 0, %loop.ph ], [ %iv.next, %loop.latch ]
+ %c = icmp eq i16 %iv, %len
+ br i1 %c, label %exit, label %for.body
+
+for.body:
+ %t.1 = icmp uge i16 %iv, 0
+ %t.2 = icmp ult i16 %iv, %a
+ %and = and i1 %t.1, %t.2
+ br i1 %and, label %loop.latch, label %exit
+
+loop.latch:
+ call void @use(i16 %iv)
+ %iv.next = add nuw i16 %iv, 2
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+define void @test_monotonic_ptr_iv_inc_2_eq_to_uge_variable_start(i16 %start, i8 %len.n, i16 %a) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_inc_2_eq_to_uge_variable_start(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[LEN:%.*]] = zext i8 [[LEN_N:%.*]] to i16
+; CHECK-NEXT: [[LEN_LT:%.*]] = icmp ult i16 [[LEN]], [[A:%.*]]
+; CHECK-NEXT: [[START_LT:%.*]] = icmp ult i16 [[START:%.*]], [[LEN]]
+; CHECK-NEXT: [[AND_0:%.*]] = and i1 [[LEN_LT]], [[START_LT]]
+; CHECK-NEXT: br i1 [[AND_0]], label [[LOOP_PH:%.*]], label [[EXIT:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[IV:%.*]] = phi i16 [ [[START]], [[LOOP_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C:%.*]] = icmp eq i16 [[IV]], [[LEN]]
+; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[T_1:%.*]] = icmp uge i16 [[IV]], 0
+; CHECK-NEXT: [[T_2:%.*]] = icmp ult i16 [[IV]], [[A]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(i16 [[IV]])
+; CHECK-NEXT: [[IV_NEXT]] = add nuw i16 [[IV]], 2
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %len = zext i8 %len.n to i16
+ %len.lt = icmp ult i16 %len, %a
+ %start.lt = icmp ult i16 %start, %len
+ %and.0 = and i1 %len.lt, %start.lt
+ br i1 %and.0, label %loop.ph, label %exit
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %iv = phi i16 [ %start, %loop.ph ], [ %iv.next, %loop.latch ]
+ %c = icmp eq i16 %iv, %len
+ br i1 %c, label %exit, label %for.body
+
+for.body:
+ %t.1 = icmp uge i16 %iv, 0
+ %t.2 = icmp ult i16 %iv, %a
+ %and = and i1 %t.1, %t.2
+ br i1 %and, label %loop.latch, label %exit
+
+loop.latch:
+ call void @use(i16 %iv)
+ %iv.next = add nuw i16 %iv, 2
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+
declare void @use(ptr)
+declare void @use.i1(i1)
declare void @llvm.assume(i1)
+declare i1 @cond()
define void @test_monotonic_ptr_iv_inc_1_eq_to_uge(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_eq_to_uge(
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT: br i1 [[C]], label [[EXIT:%.*]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
-; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
-; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: [[C_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
br i1 %c, label %exit, label %for.body
for.body:
- %t.1 = icmp uge ptr %ptr.iv, %start
- %t.2 = icmp ult ptr %ptr.iv, %upper
- %and = and i1 %t.1, %t.2
+ %c.1 = icmp uge ptr %ptr.iv, %start
+ %c.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.1, %c.2
br i1 %and, label %loop.latch, label %exit
loop.latch:
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
-; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
-; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: [[C_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
br i1 %c, label %exit, label %for.body
for.body:
- %t.1 = icmp uge ptr %ptr.iv, %start
- %t.2 = icmp ult ptr %ptr.iv, %upper
- %and = and i1 %t.1, %t.2
+ %c.1 = icmp uge ptr %ptr.iv, %start
+ %c.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.1, %c.2
br i1 %and, label %loop.latch, label %exit
loop.latch:
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
-; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
-; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: [[C_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
br i1 %c, label %exit, label %for.body
for.body:
- %t.1 = icmp uge ptr %ptr.iv, %start
- %t.2 = icmp ult ptr %ptr.iv, %upper
- %and = and i1 %t.1, %t.2
+ %c.1 = icmp uge ptr %ptr.iv, %start
+ %c.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.1, %c.2
br i1 %and, label %loop.latch, label %exit
loop.latch:
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
-; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
-; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: [[C_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
br i1 %c, label %exit, label %for.body
for.body:
- %t.1 = icmp uge ptr %ptr.iv, %start
- %t.2 = icmp ult ptr %ptr.iv, %upper
- %and = and i1 %t.1, %t.2
+ %c.1 = icmp uge ptr %ptr.iv, %start
+ %c.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.1, %c.2
br i1 %and, label %loop.latch, label %exit
loop.latch:
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
-; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
-; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: [[C_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
br i1 %c, label %exit, label %for.body
for.body:
- %t.1 = icmp uge ptr %ptr.iv, %start
- %t.2 = icmp ult ptr %ptr.iv, %upper
- %and = and i1 %t.1, %t.2
+ %c.1 = icmp uge ptr %ptr.iv, %start
+ %c.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.1, %c.2
br i1 %and, label %loop.latch, label %exit
loop.latch:
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
-; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
-; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: [[C_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
br i1 %c, label %exit, label %for.body
for.body:
- %t.1 = icmp uge ptr %ptr.iv, %start
- %t.2 = icmp ult ptr %ptr.iv, %upper
- %and = and i1 %t.1, %t.2
+ %c.1 = icmp uge ptr %ptr.iv, %start
+ %c.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.1, %c.2
br i1 %and, label %loop.latch, label %exit
loop.latch:
ret void
}
+define void @test_monotonic_ptr_iv_step_sign_positive_through_assume_multi_exit(ptr %start, i16 %len, i16 %step) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_step_sign_positive_through_assume_multi_exit(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[STEP_POS:%.*]] = icmp sge i16 [[STEP:%.*]], 0
+; CHECK-NEXT: call void @llvm.assume(i1 [[STEP_POS]])
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[C_1:%.*]] = call i1 @cond()
+; CHECK-NEXT: br i1 [[C_1]], label [[THEN:%.*]], label [[EXIT]]
+; CHECK: then:
+; CHECK-NEXT: [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
+; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 [[STEP]]
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %step.pos = icmp sge i16 %step, 0
+ call void @llvm.assume(i1 %step.pos)
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp slt i16 %len, 0
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c = icmp eq ptr %ptr.iv, %upper
+ br i1 %c, label %exit, label %for.body
+
+for.body:
+ %c.1 = call i1 @cond()
+ br i1 %c.1, label %then, label %exit
+
+then:
+ %c.2 = icmp uge ptr %ptr.iv, %start
+ %c.3 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.2, %c.3
+ br i1 %and, label %loop.latch, label %exit
+
+loop.latch:
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 %step
+ br label %loop.header
+
+exit:
+ ret void
+}
+
define void @test_monotonic_ptr_iv_step_sign_negative_through_assume(ptr %start, i16 %len, i16 %step) {
; CHECK-LABEL: @test_monotonic_ptr_iv_step_sign_negative_through_assume(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK: for.body:
-; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
-; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
-; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: [[C_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
br i1 %c, label %exit, label %for.body
for.body:
+ %c.1 = icmp uge ptr %ptr.iv, %start
+ %c.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.1, %c.2
+ br i1 %and, label %loop.latch, label %exit
+
+loop.latch:
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 %step
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+define void @test_monotonic_ptr_iv_cond_doesnt_control_exit(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_cond_doesnt_control_exit(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C_0:%.*]] = call i1 @cond()
+; CHECK-NEXT: br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
+; CHECK: then:
+; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: call void @use.i1(i1 [[AND]])
+; CHECK-NEXT: br label [[LOOP_LATCH]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp slt i16 %len, 0
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c.0 = call i1 @cond()
+ br i1 %c.0, label %exit, label %for.body
+
+for.body:
+ %c.1 = icmp ne ptr %ptr.iv, %upper
+ br i1 %c.1, label %then, label %loop.latch
+
+then:
+ %t.1 = icmp uge ptr %ptr.iv, %start
+ %t.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %t.1, %t.2
+ call void @use.i1(i1 %and)
+ br label %loop.latch
+
+loop.latch:
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+
+define void @test_monotonic_ptr_iv_cond_doesnt_dominate_checks(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_cond_doesnt_dominate_checks(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C_0:%.*]] = call i1 @cond()
+; CHECK-NEXT: br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
+; CHECK: then:
+; CHECK-NEXT: br label [[LOOP_LATCH]]
+; CHECK: loop.latch:
+; CHECK-NEXT: [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
+; CHECK-NEXT: call void @use.i1(i1 [[AND]])
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp slt i16 %len, 0
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c.0 = call i1 @cond()
+ br i1 %c.0, label %exit, label %for.body
+
+for.body:
+ %c.1 = icmp ne ptr %ptr.iv, %upper
+ br i1 %c.1, label %then, label %loop.latch
+
+then:
+ br label %loop.latch
+
+loop.latch:
+ %c.2 = icmp uge ptr %ptr.iv, %start
+ %c.3 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.2, %c.3
+ call void @use.i1(i1 %and)
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+define void @test_monotonic_ptr_iv_inc_2(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_inc_2(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 2
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp slt i16 %len, 0
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c = icmp eq ptr %ptr.iv, %upper
+ br i1 %c, label %exit, label %for.body
+
+for.body:
%t.1 = icmp uge ptr %ptr.iv, %start
%t.2 = icmp ult ptr %ptr.iv, %upper
%and = and i1 %t.1, %t.2
loop.latch:
call void @use(ptr %ptr.iv)
- %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 %step
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 2
br label %loop.header
exit:
ret void
}
+
+define void @test_monotonic_ptr_iv_step_2_multi_exit(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_step_2_multi_exit(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C_1:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C_1]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[C_0:%.*]] = call i1 @cond()
+; CHECK-NEXT: br i1 [[C_0]], label [[EXIT]], label [[THEN:%.*]]
+; CHECK: then:
+; CHECK-NEXT: [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
+; CHECK-NEXT: call void @use.i1(i1 [[AND]])
+; CHECK-NEXT: br label [[LOOP_LATCH]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 2
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp slt i16 %len, 0
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c.1 = icmp eq ptr %ptr.iv, %upper
+ br i1 %c.1, label %exit, label %for.body
+
+for.body:
+ %c.0 = call i1 @cond()
+ br i1 %c.0, label %exit, label %then
+
+then:
+ %c.2 = icmp uge ptr %ptr.iv, %start
+ %c.3 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.2, %c.3
+ call void @use.i1(i1 %and)
+ br label %loop.latch
+
+loop.latch:
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 2
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+define void @test_monotonic_ptr_iv_step_2_cond_controls_single_exit(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_step_2_cond_controls_single_exit(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C_1:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C_1]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT: call void @use.i1(i1 [[AND]])
+; CHECK-NEXT: br label [[LOOP_LATCH]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 2
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp slt i16 %len, 0
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c.1 = icmp eq ptr %ptr.iv, %upper
+ br i1 %c.1, label %exit, label %for.body
+
+for.body:
+ %t.1 = icmp uge ptr %ptr.iv, %start
+ %t.2 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %t.1, %t.2
+ call void @use.i1(i1 %and)
+ br label %loop.latch
+
+loop.latch:
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 2
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+define void @test_monotonic_ptr_iv_step_2_cond_doesnt_control_exit(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_step_2_cond_doesnt_control_exit(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT: br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C_0:%.*]] = call i1 @cond()
+; CHECK-NEXT: br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
+; CHECK: then:
+; CHECK-NEXT: [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
+; CHECK-NEXT: call void @use.i1(i1 [[AND]])
+; CHECK-NEXT: br label [[LOOP_LATCH]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 2
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp slt i16 %len, 0
+ br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c.0 = call i1 @cond()
+ br i1 %c.0, label %exit, label %for.body
+
+for.body:
+ %c.1 = icmp ne ptr %ptr.iv, %upper
+ br i1 %c.1, label %then, label %loop.latch
+
+then:
+ %c.2 = icmp uge ptr %ptr.iv, %start
+ %c.3 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.2, %c.3
+ call void @use.i1(i1 %and)
+ br label %loop.latch
+
+loop.latch:
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 2
+ br label %loop.header
+
+exit:
+ ret void
+}
+
+
+define void @test_monotonic_ptr_iv_inc_1_check_outside_loop(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_check_outside_loop(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT: [[LEN_NEG:%.*]] = icmp sge i16 [[LEN]], 0
+; CHECK-NEXT: call void @llvm.assume(i1 [[LEN_NEG]])
+; CHECK-NEXT: br label [[LOOP_PH:%.*]]
+; CHECK: loop.ph:
+; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
+; CHECK: loop.header:
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT: [[C_0:%.*]] = call i1 @cond()
+; CHECK-NEXT: br i1 [[C_0]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
+; CHECK: loop.latch:
+; CHECK-NEXT: call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
+; CHECK-NEXT: br label [[LOOP_HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: br i1 [[C_1]], label [[THEN:%.*]], label [[EXIT_2:%.*]]
+; CHECK: then:
+; CHECK-NEXT: [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT: [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
+; CHECK-NEXT: call void @use.i1(i1 [[AND]])
+; CHECK-NEXT: br label [[EXIT_2]]
+; CHECK: exit.2:
+; CHECK-NEXT: ret void
+;
+entry:
+ %upper = getelementptr inbounds i32, ptr %start, i16 %len
+ %len.neg = icmp sge i16 %len, 0
+ call void @llvm.assume(i1 %len.neg)
+ br label %loop.ph
+
+loop.ph:
+ br label %loop.header
+
+loop.header:
+ %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+ %c.0 = call i1 @cond()
+ br i1 %c.0, label %exit, label %loop.latch
+
+loop.latch:
+ call void @use(ptr %ptr.iv)
+ %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
+ br label %loop.header
+
+exit:
+ %c.1 = icmp ne ptr %ptr.iv, %upper
+ br i1 %c.1, label %then, label %exit.2
+
+then:
+ %c.2 = icmp uge ptr %ptr.iv, %start
+ %c.3 = icmp ult ptr %ptr.iv, %upper
+ %and = and i1 %c.2, %c.3
+ call void @use.i1(i1 %and)
+ br label %exit.2
+
+exit.2:
+ ret void
+}