; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=instcombine -S < %s | FileCheck %s
; Check that we can turn the icmp sle into icmp ult, regardless of the
; order of the incoming values of the PHI node.
declare i1 @cond()
define void @phi_recurrence_start_first() {
; CHECK-LABEL: @phi_recurrence_start_first(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[WHILE_COND:%.*]]
; CHECK: while.cond:
; CHECK-NEXT: [[CELL_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[START:%.*]], [[FOR_COND26:%.*]] ]
; CHECK-NEXT: [[COND_V:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[COND_V]], label [[IF_THEN:%.*]], label [[WHILE_END:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[START]] = add nuw nsw i32 [[CELL_0]], 1
; CHECK-NEXT: [[COND_V2:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[COND_V2]], label [[FOR_COND11:%.*]], label [[FOR_COND26]]
; CHECK: for.cond11:
; CHECK-NEXT: [[I_1:%.*]] = phi i32 [ [[START]], [[IF_THEN]] ], [ [[STEP:%.*]], [[FOR_COND11]] ]
; CHECK-NEXT: [[CMP13:%.*]] = icmp ult i32 [[I_1]], 100
; CHECK-NEXT: [[STEP]] = add nuw nsw i32 [[I_1]], 1
; CHECK-NEXT: br i1 [[CMP13]], label [[FOR_COND11]], label [[WHILE_END]]
; CHECK: for.cond26:
; CHECK-NEXT: br label [[WHILE_COND]]
; CHECK: while.end:
; CHECK-NEXT: ret void
;
entry:
br label %while.cond
while.cond: ; preds = %entry, %for.cond26
%cell.0 = phi i32 [ 0, %entry ], [ %start, %for.cond26 ]
%cond.v = call i1 @cond()
br i1 %cond.v, label %if.then, label %while.end
if.then: ; preds = %while.cond
%start = add nsw i32 %cell.0, 1
%cond.v2 = call i1 @cond()
br i1 %cond.v2, label %for.cond11, label %for.cond26
for.cond11: ; preds = %for.cond11, %if.then
%i.1 = phi i32 [ %start, %if.then ], [ %step, %for.cond11 ]
%cmp13 = icmp sle i32 %i.1, 99
%step = add nsw i32 %i.1, 1
br i1 %cmp13, label %for.cond11, label %while.end
for.cond26: ; preds = %if.then
br label %while.cond
while.end: ; preds = %while.cond, %for.cond11
ret void
}
define void @phi_recurrence_step_first() {
; CHECK-LABEL: @phi_recurrence_step_first(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[WHILE_COND:%.*]]
; CHECK: while.cond:
; CHECK-NEXT: [[CELL_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[START:%.*]], [[FOR_COND26:%.*]] ]
; CHECK-NEXT: [[COND_V:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[COND_V]], label [[IF_THEN:%.*]], label [[WHILE_END:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[START]] = add nuw nsw i32 [[CELL_0]], 1
; CHECK-NEXT: [[COND_V2:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[COND_V2]], label [[FOR_COND11:%.*]], label [[FOR_COND26]]
; CHECK: for.cond11:
; CHECK-NEXT: [[I_1:%.*]] = phi i32 [ [[STEP:%.*]], [[FOR_COND11]] ], [ [[START]], [[IF_THEN]] ]
; CHECK-NEXT: [[CMP13:%.*]] = icmp ult i32 [[I_1]], 100
; CHECK-NEXT: [[STEP]] = add nuw nsw i32 [[I_1]], 1
; CHECK-NEXT: br i1 [[CMP13]], label [[FOR_COND11]], label [[WHILE_END]]
; CHECK: for.cond26:
; CHECK-NEXT: br label [[WHILE_COND]]
; CHECK: while.end:
; CHECK-NEXT: ret void
;
entry:
br label %while.cond
while.cond: ; preds = %entry, %for.cond26
%cell.0 = phi i32 [ 0, %entry ], [ %start, %for.cond26 ]
%cond.v = call i1 @cond()
br i1 %cond.v, label %if.then, label %while.end
if.then: ; preds = %while.cond
%start = add nsw i32 %cell.0, 1
%cond.v2 = call i1 @cond()
br i1 %cond.v2, label %for.cond11, label %for.cond26
for.cond11: ; preds = %for.cond11, %if.then
%i.1 = phi i32 [ %step, %for.cond11 ], [ %start, %if.then]
%cmp13 = icmp sle i32 %i.1, 99
%step = add nsw i32 %i.1, 1
br i1 %cmp13, label %for.cond11, label %while.end
for.cond26: ; preds = %if.then
br label %while.cond
while.end: ; preds = %while.cond, %for.cond11
ret void
}
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