; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt < %s -S -passes='loop(simple-loop-unswitch),instcombine<no-verify-fixpoint>' -verify-memoryssa | FileCheck %s
; We do not reach a fixpoint, because we first have to infer nsw on the IV add,
; and could eliminate the icmp slt afterwards, but don't revisit it.
@.str9 = external constant [1 x i8]
declare i32 @strcmp(ptr, ptr)
define i32 @_ZN9Generator6strregEPKc(ptr %this, ptr %s) {
; CHECK-LABEL: define i32 @_ZN9Generator6strregEPKc(
; CHECK-SAME: ptr [[THIS:%.*]], ptr [[S:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP122:%.*]] = icmp eq ptr [[S]], null
; CHECK-NEXT: br label [[BB184:%.*]]
; CHECK: bb55:
; CHECK-NEXT: ret i32 0
; CHECK: bb88:
; CHECK-NEXT: br i1 [[TMP122]], label [[BB154:%.*]], label [[BB128:%.*]]
; CHECK: bb128:
; CHECK-NEXT: [[TMP138:%.*]] = call i32 @strcmp(ptr noundef nonnull dereferenceable(1) null, ptr noundef nonnull dereferenceable(1) [[S]])
; CHECK-NEXT: [[IFTMP_37_0_IN4:%.*]] = icmp eq i32 [[TMP138]], 0
; CHECK-NEXT: br i1 [[IFTMP_37_0_IN4]], label [[BB250:%.*]], label [[BB166:%.*]]
; CHECK: bb154:
; CHECK-NEXT: br i1 false, label [[BB250]], label [[BB166]]
; CHECK: bb166:
; CHECK-NEXT: [[TMP175:%.*]] = add i32 [[IDX_0:%.*]], 1
; CHECK-NEXT: [[TMP183:%.*]] = add nsw i32 [[I33_0:%.*]], 1
; CHECK-NEXT: br label [[BB184]]
; CHECK: bb184:
; CHECK-NEXT: [[I33_0]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[TMP183]], [[BB166]] ]
; CHECK-NEXT: [[IDX_0]] = phi i32 [ 0, [[ENTRY]] ], [ [[TMP175]], [[BB166]] ]
; CHECK-NEXT: [[TMP49:%.*]] = icmp slt i32 [[I33_0]], 0
; CHECK-NEXT: br i1 [[TMP49]], label [[BB88:%.*]], label [[BB55:%.*]]
; CHECK: bb250:
; CHECK-NEXT: ret i32 [[IDX_0]]
;
entry:
%s_addr.0 = select i1 false, ptr @.str9, ptr %s
%tmp122 = icmp eq ptr %s_addr.0, null
br label %bb184
bb55:
ret i32 0
bb88:
br i1 %tmp122, label %bb154, label %bb128
bb128:
%tmp138 = call i32 @strcmp( ptr null, ptr %s_addr.0 )
%iftmp.37.0.in4 = icmp eq i32 %tmp138, 0
br i1 %iftmp.37.0.in4, label %bb250, label %bb166
bb154:
br i1 false, label %bb250, label %bb166
bb166:
%tmp175 = add i32 %idx.0, 1
%tmp177 = add i32 %tmp175, 0
%tmp181 = add i32 %tmp177, 0
%tmp183 = add i32 %i33.0, 1
br label %bb184
bb184:
%i33.0 = phi i32 [ 0, %entry ], [ %tmp183, %bb166 ]
%idx.0 = phi i32 [ 0, %entry ], [ %tmp181, %bb166 ]
%tmp49 = icmp slt i32 %i33.0, 0
br i1 %tmp49, label %bb88, label %bb55
bb250:
ret i32 %idx.0
}
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