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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=instcombine -S < %s | FileCheck %s
declare void @bar()
declare void @baz()
; Check that !noundef metadata is combined
define ptr @test_phi_combine_load_metadata(i1 %c, ptr dereferenceable(8) %p1, ptr dereferenceable(8) %p2) {
; CHECK-LABEL: @test_phi_combine_load_metadata(
; CHECK-NEXT: br i1 [[C:%.*]], label [[T:%.*]], label [[F:%.*]]
; CHECK: t:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[CONT:%.*]]
; CHECK: f:
; CHECK-NEXT: call void @baz()
; CHECK-NEXT: br label [[CONT]]
; CHECK: cont:
; CHECK-NEXT: [[RES_IN:%.*]] = phi ptr [ [[P1:%.*]], [[T]] ], [ [[P2:%.*]], [[F]] ]
; CHECK-NEXT: [[RES:%.*]] = load ptr, ptr [[RES_IN]], align 8, !noundef !0
; CHECK-NEXT: ret ptr [[RES]]
;
br i1 %c, label %t, label %f
t:
call void @bar()
%v1 = load ptr, ptr %p1, align 8, !noundef !0
br label %cont
f:
call void @baz()
%v2 = load ptr, ptr %p2, align 8, !noundef !0
br label %cont
cont:
%res = phi ptr [ %v1, %t ], [ %v2, %f ]
ret ptr %res
}
; Check that !noundef metadata is not combined as a result of
; there is a load don't have a noundef metadata.
define ptr @test_phi_combine_load_metadata_negative(i1 %c, ptr dereferenceable(8) %p1, ptr dereferenceable(8) %p2) {
; CHECK-LABEL: @test_phi_combine_load_metadata_negative(
; CHECK-NEXT: br i1 [[C:%.*]], label [[T:%.*]], label [[F:%.*]]
; CHECK: t:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[CONT:%.*]]
; CHECK: f:
; CHECK-NEXT: call void @baz()
; CHECK-NEXT: br label [[CONT]]
; CHECK: cont:
; CHECK-NEXT: [[RES_IN:%.*]] = phi ptr [ [[P1:%.*]], [[T]] ], [ [[P2:%.*]], [[F]] ]
; CHECK-NEXT: [[RES:%.*]] = load ptr, ptr [[RES_IN]], align 8
; CHECK-NEXT: ret ptr [[RES]]
;
br i1 %c, label %t, label %f
t:
call void @bar()
%v1 = load ptr, ptr %p1, align 8, !noundef !0
br label %cont
f:
call void @baz()
%v2 = load ptr, ptr %p2, align 8
br label %cont
cont:
%res = phi ptr [ %v1, %t ], [ %v2, %f ]
ret ptr %res
}
!0 = !{}
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