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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -basic-aa -gvn -enable-split-backedge-in-load-pre=true < %s | FileCheck %s --check-prefix=ON
; RUN: opt -S -basic-aa -gvn -enable-split-backedge-in-load-pre=false < %s | FileCheck %s --check-prefix=OFF
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
define i32 @test(i1 %b, i1 %c, i32* noalias %p, i32* noalias %q) {
; ON-LABEL: @test(
; ON-NEXT: entry:
; ON-NEXT: [[Y1:%.*]] = load i32, i32* [[P:%.*]], align 4
; ON-NEXT: call void @use(i32 [[Y1]])
; ON-NEXT: br label [[HEADER:%.*]]
; ON: header:
; ON-NEXT: [[Y:%.*]] = phi i32 [ [[Y_PRE:%.*]], [[SKIP_HEADER_CRIT_EDGE:%.*]] ], [ [[Y]], [[HEADER]] ], [ [[Y1]], [[ENTRY:%.*]] ]
; ON-NEXT: call void @use(i32 [[Y]])
; ON-NEXT: br i1 [[B:%.*]], label [[SKIP:%.*]], label [[HEADER]]
; ON: skip:
; ON-NEXT: call void @clobber(i32* [[P]], i32* [[Q:%.*]])
; ON-NEXT: br i1 [[C:%.*]], label [[SKIP_HEADER_CRIT_EDGE]], label [[EXIT:%.*]]
; ON: skip.header_crit_edge:
; ON-NEXT: [[Y_PRE]] = load i32, i32* [[P]], align 4
; ON-NEXT: br label [[HEADER]]
; ON: exit:
; ON-NEXT: ret i32 [[Y]]
;
; OFF-LABEL: @test(
; OFF-NEXT: entry:
; OFF-NEXT: [[Y1:%.*]] = load i32, i32* [[P:%.*]], align 4
; OFF-NEXT: call void @use(i32 [[Y1]])
; OFF-NEXT: br label [[HEADER:%.*]]
; OFF: header:
; OFF-NEXT: [[Y:%.*]] = load i32, i32* [[P]], align 4
; OFF-NEXT: call void @use(i32 [[Y]])
; OFF-NEXT: br i1 [[B:%.*]], label [[SKIP:%.*]], label [[HEADER]]
; OFF: skip:
; OFF-NEXT: call void @clobber(i32* [[P]], i32* [[Q:%.*]])
; OFF-NEXT: br i1 [[C:%.*]], label [[HEADER]], label [[EXIT:%.*]]
; OFF: exit:
; OFF-NEXT: ret i32 [[Y]]
;
entry:
%y1 = load i32, i32* %p
call void @use(i32 %y1)
br label %header
header:
%y = load i32, i32* %p
call void @use(i32 %y)
br i1 %b, label %skip, label %header
skip:
call void @clobber(i32* %p, i32* %q)
br i1 %c, label %header, label %exit
exit:
ret i32 %y
}
declare void @use(i32) readonly
declare void @clobber(i32* %p, i32* %q)
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