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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes='loop-mssa(indvars,indvars)' -S < %s | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
@c = external global i16, align 1
@a = external global i16, align 1
; When we delete %c.promoted, we need to ensure we clear the getSCEVAtScope
; cache or we'll crash trying to access loop disposition of the exit value
; for the remaining IV.
define void @f() {
; CHECK-LABEL: @f(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: br i1 false, label [[FOR_BODY:%.*]], label [[FOR_END4:%.*]]
; CHECK: for.body:
; CHECK-NEXT: br label [[FOR_BODY2:%.*]]
; CHECK: for.body2:
; CHECK-NEXT: [[INC2:%.*]] = phi i16 [ undef, [[FOR_BODY]] ], [ [[INC:%.*]], [[FOR_BODY2]] ]
; CHECK-NEXT: [[INC]] = add nsw i16 [[INC2]], 1
; CHECK-NEXT: store i16 [[INC]], i16* undef, align 1
; CHECK-NEXT: br i1 true, label [[FOR_BODY2]], label [[CRIT_EDGE:%.*]]
; CHECK: crit_edge:
; CHECK-NEXT: [[INC_LCSSA:%.*]] = phi i16 [ [[INC]], [[FOR_BODY2]] ]
; CHECK-NEXT: store i16 [[INC_LCSSA]], i16* @a, align 1
; CHECK-NEXT: unreachable
; CHECK: for.end4:
; CHECK-NEXT: ret void
;
entry:
br label %for.cond
for.cond: ; preds = %entry
br i1 false, label %for.body, label %for.end4
for.body: ; preds = %for.cond
%c.promoted = load i16, i16* @c, align 1
br label %for.body2
for.body2: ; preds = %for.body2, %for.body
%inc33 = phi i16 [ %c.promoted, %for.body ], [ %inc3, %for.body2 ]
%inc2 = phi i16 [ undef, %for.body ], [ %inc, %for.body2 ]
%inc = add nsw i16 %inc2, 1
store i16 %inc, i16* undef, align 1
%inc3 = add nsw i16 %inc33, 1
%tobool = icmp ne i16 %inc3, 0
br i1 %tobool, label %for.body2, label %crit_edge
crit_edge: ; preds = %for.body2
%inc.lcssa = phi i16 [ %inc, %for.body2 ]
store i16 %inc.lcssa, i16* @a, align 1
unreachable
for.end4: ; preds = %for.cond
ret void
}
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