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[MemCpyOpt] Add test for PR54682 (NFC)

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Nikita Popov 2022-04-01 16:31:08 +02:00
parent 14e5f9785c
commit 34135ae9e2
1 changed files with 40 additions and 0 deletions
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llvm/test/Transforms/MemCpyOpt/pr54682.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -memcpyopt < %s | FileCheck %s
; FIXME: This currently gets miscompiled.
define void @test(i1 %c, i8* nocapture noundef readonly %path, i8* noundef writeonly %name) {
; CHECK-LABEL: @test(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP:%.*]] = alloca [260 x i8], align 16
; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
; CHECK: while.body:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[WHILE_BODY]] ], [ 259, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], -1
; CHECK-NEXT: [[TMP_IV:%.*]] = getelementptr inbounds [260 x i8], [260 x i8]* [[TMP]], i64 0, i64 [[IV]]
; CHECK-NEXT: store i8 42, i8* [[TMP_IV]], align 1
; CHECK-NEXT: br i1 [[C:%.*]], label [[WHILE_BODY]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: [[TMP_IV_1:%.*]] = getelementptr inbounds i8, i8* [[TMP_IV]], i64 1
; CHECK-NEXT: [[LEN:%.*]] = sub nsw i64 259, [[IV]]
; CHECK-NEXT: ret void
;
entry:
%tmp = alloca [260 x i8], align 16
br label %while.body
while.body:
%iv = phi i64 [ %iv.next, %while.body ], [ 259, %entry ]
%iv.next = add nsw i64 %iv, -1
%tmp.iv = getelementptr inbounds [260 x i8], [260 x i8]* %tmp, i64 0, i64 %iv
store i8 42, i8* %tmp.iv, align 1
br i1 %c, label %while.body, label %exit
exit:
%tmp.iv.1 = getelementptr inbounds i8, i8* %tmp.iv, i64 1
%len = sub nsw i64 259, %iv
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %name, i8* nonnull align 1 %tmp.iv.1, i64 %len, i1 false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly %0, i8* noalias nocapture readonly %1, i64 %2, i1 immarg %3)