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https://github.com/Gericom/teak-llvm.git
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1251cac62a
Summary: Bug: https://bugs.llvm.org/show_bug.cgi?id=39024 The bug reports that a vectorized loop is stepped through 4 times and each step through the loop seemed to show a different path. I found two problems here: A) An incorrect line number on a preheader block (for.body.preheader) instruction causes a step into the loop before it begins. B) Instructions in the middle block have different line numbers which give the impression of another iteration. In this patch I give all of the middle block instructions the line number of the scalar loop latch terminator branch. This seems to provide the smoothest debugging experience because the vectorized loops will always end on this line before dropping into the scalar loop. To solve problem A I have altered llvm::SplitBlockPredecessors to accommodate loop header blocks. I have set up a separate review D61933 for a fix which is required for this patch. Reviewers: samsonov, vsk, aprantl, probinson, anemet, hfinkel, jmorse Reviewed By: hfinkel, jmorse Subscribers: jmorse, javed.absar, eraman, kcc, bjope, jmellorcrummey, hfinkel, gbedwell, hiraditya, zzheng, llvm-commits Tags: #llvm, #debug-info Differential Revision: https://reviews.llvm.org/D60831 > llvm-svn: 363046 llvm-svn: 363786
56 lines
3.0 KiB
LLVM
56 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -basicaa -debugify -loop-idiom -pass-remarks=loop-idiom -pass-remarks-analysis=loop-idiom -verify -verify-each -verify-dom-info -verify-loop-info < %s -S 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Check that everything still works when debuginfo is present, and that it is reasonably propagated.
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; void my_basic_memset(char* begin, char* end, char value) {
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; for( ; begin != end; ++begin)
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; *begin = value;
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; }
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; CHECK: remark: <stdin>:4:1: Transformed loop-strided store into a call to llvm.memset.p0i8.i64() function
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define void @_Z15my_basic_memsetPcS_c(i8* %ptr, i8* %end, i8 %value) {
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; CHECK-LABEL: @_Z15my_basic_memsetPcS_c(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[PTR1:%.*]] = ptrtoint i8* [[PTR:%.*]] to i64
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; CHECK-NEXT: [[CMP3:%.*]] = icmp eq i8* [[PTR]], [[END:%.*]], !dbg !15
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i1 [[CMP3]], metadata !9, metadata !DIExpression()), !dbg !15
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; CHECK-NEXT: br i1 [[CMP3]], label [[FOR_END:%.*]], label [[FOR_BODY_PREHEADER:%.*]], !dbg !16
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; CHECK: for.body.preheader:
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; CHECK-NEXT: [[TMP0:%.*]] = sub i64 0, [[PTR1]], !dbg !17
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; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* [[END]], i64 [[TMP0]], !dbg !17
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; CHECK-NEXT: [[SCEVGEP2:%.*]] = ptrtoint i8* [[SCEVGEP]] to i64
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[PTR]], i8 [[VALUE:%.*]], i64 [[SCEVGEP2]], i1 false), !dbg !18
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; CHECK-NEXT: br label [[FOR_BODY:%.*]], !dbg !17
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; CHECK: for.body:
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; CHECK-NEXT: [[PTR_ADDR_04:%.*]] = phi i8* [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[PTR]], [[FOR_BODY_PREHEADER]] ], !dbg !19
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* [[PTR_ADDR_04]], metadata !11, metadata !DIExpression()), !dbg !19
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; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i8, i8* [[PTR_ADDR_04]], i64 1, !dbg !20
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* [[INCDEC_PTR]], metadata !13, metadata !DIExpression()), !dbg !20
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[INCDEC_PTR]], [[END]], !dbg !21
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i1 [[CMP]], metadata !14, metadata !DIExpression()), !dbg !21
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; CHECK-NEXT: br i1 [[CMP]], label [[FOR_END_LOOPEXIT:%.*]], label [[FOR_BODY]], !dbg !17
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; CHECK: for.end.loopexit:
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; CHECK-NEXT: br label [[FOR_END]], !dbg !22
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; CHECK: for.end:
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; CHECK-NEXT: ret void, !dbg !22
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;
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entry:
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%cmp3 = icmp eq i8* %ptr, %end
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br i1 %cmp3, label %for.end, label %for.body
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for.body: ; preds = %entry, %for.body
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%ptr.addr.04 = phi i8* [ %incdec.ptr, %for.body ], [ %ptr, %entry ]
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store i8 %value, i8* %ptr.addr.04, align 1
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%incdec.ptr = getelementptr inbounds i8, i8* %ptr.addr.04, i64 1
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%cmp = icmp eq i8* %incdec.ptr, %end
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br i1 %cmp, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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ret void
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}
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