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[LoopIdiom] Added testcase for double memset (fixed in LLVM 12); NFC

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Dávid Bolvanský 2021-04-22 16:39:07 +02:00
parent 755240196c
commit 78fb52ea7c
1 changed files with 48 additions and 0 deletions
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48
test/Transforms/LoopIdiom/memset.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -basic-aa -loop-idiom < %s -S | FileCheck %s
define dso_local void @double_memset(i8* nocapture %p, i8* noalias nocapture %q, i32 %n) {
; CHECK-LABEL: @double_memset(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP4:%.*]] = icmp sgt i32 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[CMP4]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_COND_CLEANUP:%.*]]
; CHECK: for.body.preheader:
; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[N]] to i64
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[Q:%.*]], i8 0, i64 [[TMP0]], i1 false)
; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[N]] to i64
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[P:%.*]], i8 0, i64 [[TMP1]], i1 false)
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.cond.cleanup.loopexit:
; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
; CHECK: for.body:
; CHECK-NEXT: [[I_07:%.*]] = phi i32 [ [[INC:%.*]], [[FOR_BODY]] ], [ 0, [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[P_ADDR_06:%.*]] = phi i8* [ [[INCDEC_PTR1:%.*]], [[FOR_BODY]] ], [ [[P]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[Q_ADDR_05:%.*]] = phi i8* [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[Q]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i8, i8* [[Q_ADDR_05]], i64 1
; CHECK-NEXT: [[INCDEC_PTR1]] = getelementptr inbounds i8, i8* [[P_ADDR_06]], i64 1
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I_07]], 1
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i32 [[INC]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP_LOOPEXIT:%.*]], label [[FOR_BODY]]
;
entry:
%cmp4 = icmp sgt i32 %n, 0
br i1 %cmp4, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
for.body:
%i.07 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
%p.addr.06 = phi i8* [ %incdec.ptr1, %for.body ], [ %p, %entry ]
%q.addr.05 = phi i8* [ %incdec.ptr, %for.body ], [ %q, %entry ]
%incdec.ptr = getelementptr inbounds i8, i8* %q.addr.05, i64 1
store i8 0, i8* %q.addr.05, align 1
%incdec.ptr1 = getelementptr inbounds i8, i8* %p.addr.06, i64 1
store i8 0, i8* %p.addr.06, align 1
%inc = add nuw nsw i32 %i.07, 1
%exitcond.not = icmp eq i32 %inc, %n
br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}