99d6c6d936
This patch moves branch condition creation to enter the scalar epilogue loop to VPlan. Modeling the branch in the middle block also requires modeling the successor blocks. This is done using the recently introduced VPIRBasicBlock. Note that the middle.block is still created as part of the skeleton and then patched in during VPlan execution. Unfortunately the skeleton needs to create the middle.block early on, as it is also used for induction resume value creation and is also needed to properly update the dominator tree during skeleton creation. After this patch lands, I plan to move induction resume value and phi node creation in the scalar preheader to VPlan. Once that is done, we should be able to create the middle.block in VPlan directly. This is a re-worked version based on the earlier https://reviews.llvm.org/D150398 and the main change is the use of VPIRBasicBlock. Depends on https://github.com/llvm/llvm-project/pull/92525 PR: https://github.com/llvm/llvm-project/pull/92651
84 lines
3.4 KiB
LLVM
84 lines
3.4 KiB
LLVM
; Confirm that the line numbers for the middle.block operations are all the
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; same as the start of the loop.
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; RUN: opt -S -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=4 <%s | FileCheck %s
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;
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; CHECK: middle.block:
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; CHECK-NEXT: %{{.*}}= add <4 x i32>{{.*}}, !dbg ![[DL:[0-9]+]]
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; CHECK-NEXT: %{{.*}}= add <4 x i32>{{.*}}, !dbg ![[DL]]
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; CHECK-NEXT: %{{.*}}= add <4 x i32>{{.*}}, !dbg ![[DL]]
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; CHECK-NEXT: %{{.*}}= call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> {{.*}}), !dbg ![[DL]]
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; CHECK-NEXT: %{{.*}}= icmp eq i64{{.*}}, !dbg ![[DL]]
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; CHECK-NEXT: br i1 %{{.*}}, !dbg ![[DL]]
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; CHECK: ![[DL]] = !DILocation(line: 5,
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; This IR can be generated by running:
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; clang -gmlt -S src.cpp -emit-llvm -mllvm -opt-bisect-limit=56 -O2 -o -
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;
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; Where src.cpp contains:
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; int foo(int count, int *bar)
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; {
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; int ret = count;
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; int tmp;
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; for (int j = 0; j < count; j++) {
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; tmp = bar[j];
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; ret += tmp;
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; }
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;
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; return ret;
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; }
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define dso_local i32 @"foo"(i32 %count, ptr nocapture readonly %bar) local_unnamed_addr !dbg !8 {
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entry:
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%cmp8 = icmp sgt i32 %count, 0, !dbg !10
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br i1 %cmp8, label %for.body.preheader, label %for.cond.cleanup, !dbg !10
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for.body.preheader: ; preds = %entry
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%wide.trip.count = zext i32 %count to i64
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br label %for.body, !dbg !11
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for.cond.cleanup.loopexit: ; preds = %for.body
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%add.lcssa = phi i32 [ %add, %for.body ], !dbg !12
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br label %for.cond.cleanup, !dbg !13
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for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
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%ret.0.lcssa = phi i32 [ %count, %entry ], [ %add.lcssa, %for.cond.cleanup.loopexit ], !dbg !14
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ret i32 %ret.0.lcssa, !dbg !13
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for.body: ; preds = %for.body, %for.body.preheader
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%indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
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%ret.09 = phi i32 [ %count, %for.body.preheader ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i32, ptr %bar, i64 %indvars.iv, !dbg !11
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%0 = load i32, ptr %arrayidx, align 4, !dbg !11, !tbaa !15
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%add = add nsw i32 %0, %ret.09, !dbg !12
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !10
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count, !dbg !10
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br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body, !dbg !10, !llvm.loop !19
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "src.cpp", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"CodeView", i32 1}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 2}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!""}
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!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !9, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!9 = !DISubroutineType(types: !2)
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!10 = !DILocation(line: 5, scope: !8)
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!11 = !DILocation(line: 6, scope: !8)
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!12 = !DILocation(line: 7, scope: !8)
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!13 = !DILocation(line: 10, scope: !8)
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!14 = !DILocation(line: 0, scope: !8)
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!15 = !{!16, !16, i64 0}
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!16 = !{!"int", !17, i64 0}
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!17 = !{!"omnipotent char", !18, i64 0}
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!18 = !{!"Simple C++ TBAA"}
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!19 = distinct !{!19, !10, !20}
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!20 = !DILocation(line: 8, scope: !8)
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