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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -keep-loops=false -S < %s | FileCheck %s
; RUN: opt -passes='simplifycfg<no-keep-loops>' -S < %s | FileCheck %s
; It's not worthwhile to if-convert one of the phi nodes and leave
; the other behind, because that still requires a branch. If
; SimplifyCFG if-converts one of the phis, it should do both.
define i32 @upper_bound(ptr %r, i32 %high, i32 %k) nounwind {
; CHECK-LABEL: @upper_bound(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[WHILE_COND:%.*]]
; CHECK: while.cond:
; CHECK-NEXT: [[HIGH_ADDR_0:%.*]] = phi i32 [ [[HIGH:%.*]], [[ENTRY:%.*]] ], [ [[SPEC_SELECT:%.*]], [[WHILE_BODY:%.*]] ]
; CHECK-NEXT: [[LOW_0:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SPEC_SELECT1:%.*]], [[WHILE_BODY]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[LOW_0]], [[HIGH_ADDR_0]]
; CHECK-NEXT: br i1 [[CMP]], label [[WHILE_BODY]], label [[WHILE_END:%.*]]
; CHECK: while.body:
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[LOW_0]], [[HIGH_ADDR_0]]
; CHECK-NEXT: [[DIV:%.*]] = udiv i32 [[ADD]], 2
; CHECK-NEXT: [[IDXPROM:%.*]] = zext i32 [[DIV]] to i64
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[R:%.*]], i64 [[IDXPROM]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; CHECK-NEXT: [[CMP1:%.*]] = icmp ult i32 [[K:%.*]], [[TMP0]]
; CHECK-NEXT: [[ADD2:%.*]] = add i32 [[DIV]], 1
; CHECK-NEXT: [[SPEC_SELECT]] = select i1 [[CMP1]], i32 [[DIV]], i32 [[HIGH_ADDR_0]]
; CHECK-NEXT: [[SPEC_SELECT1]] = select i1 [[CMP1]], i32 [[LOW_0]], i32 [[ADD2]]
; CHECK-NEXT: br label [[WHILE_COND]]
; CHECK: while.end:
; CHECK-NEXT: ret i32 [[LOW_0]]
;
entry:
br label %while.cond
while.cond: ; preds = %if.then, %if.else, %entry
%high.addr.0 = phi i32 [ %high, %entry ], [ %div, %if.then ], [ %high.addr.0, %if.else ]
%low.0 = phi i32 [ 0, %entry ], [ %low.0, %if.then ], [ %add2, %if.else ]
%cmp = icmp ult i32 %low.0, %high.addr.0
br i1 %cmp, label %while.body, label %while.end
while.body: ; preds = %while.cond
%add = add i32 %low.0, %high.addr.0
%div = udiv i32 %add, 2
%idxprom = zext i32 %div to i64
%arrayidx = getelementptr inbounds i32, ptr %r, i64 %idxprom
%0 = load i32, ptr %arrayidx
%cmp1 = icmp ult i32 %k, %0
br i1 %cmp1, label %if.then, label %if.else
if.then: ; preds = %while.body
br label %while.cond
if.else: ; preds = %while.body
%add2 = add i32 %div, 1
br label %while.cond
while.end: ; preds = %while.cond
ret i32 %low.0
}
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