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https://github.com/c64scene-ar/llvm-6502.git
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02474a32eb
argument of the llvm.dbg.declare/llvm.dbg.value intrinsics. Previously, DIVariable was a variable-length field that has an optional reference to a Metadata array consisting of a variable number of complex address expressions. In the case of OpPiece expressions this is wasting a lot of storage in IR, because when an aggregate type is, e.g., SROA'd into all of its n individual members, the IR will contain n copies of the DIVariable, all alike, only differing in the complex address reference at the end. By making the complex address into an extra argument of the dbg.value/dbg.declare intrinsics, all of the pieces can reference the same variable and the complex address expressions can be uniqued across the CU, too. Down the road, this will allow us to move other flags, such as "indirection" out of the DIVariable, too. The new intrinsics look like this: declare void @llvm.dbg.declare(metadata %storage, metadata %var, metadata %expr) declare void @llvm.dbg.value(metadata %storage, i64 %offset, metadata %var, metadata %expr) This patch adds a new LLVM-local tag to DIExpressions, so we can detect and pretty-print DIExpression metadata nodes. What this patch doesn't do: This patch does not touch the "Indirect" field in DIVariable; but moving that into the expression would be a natural next step. http://reviews.llvm.org/D4919 rdar://problem/17994491 Thanks to dblaikie and dexonsmith for reviewing this patch! Note: I accidentally committed a bogus older version of this patch previously. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218787 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
5.0 KiB
LLVM
77 lines
5.0 KiB
LLVM
; RUN: llc < %s
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32"
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target triple = "thumbv7-apple-darwin3.0.0-iphoneos"
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@length = common global i32 0, align 4 ; <i32*> [#uses=1]
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define void @x0(i8* nocapture %buf, i32 %nbytes) nounwind optsize {
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entry:
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tail call void @llvm.dbg.value(metadata !{i8* %buf}, i64 0, metadata !0, metadata !{i32 786690}), !dbg !15
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tail call void @llvm.dbg.value(metadata !{i32 %nbytes}, i64 0, metadata !8, metadata !{i32 786690}), !dbg !16
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%tmp = load i32* @length, !dbg !17 ; <i32> [#uses=3]
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%cmp = icmp eq i32 %tmp, -1, !dbg !17 ; <i1> [#uses=1]
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%cmp.not = xor i1 %cmp, true ; <i1> [#uses=1]
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%cmp3 = icmp ult i32 %tmp, %nbytes, !dbg !17 ; <i1> [#uses=1]
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%or.cond = and i1 %cmp.not, %cmp3 ; <i1> [#uses=1]
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tail call void @llvm.dbg.value(metadata !{i32 %tmp}, i64 0, metadata !8, metadata !{i32 786690}), !dbg !17
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%nbytes.addr.0 = select i1 %or.cond, i32 %tmp, i32 %nbytes ; <i32> [#uses=1]
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tail call void @llvm.dbg.value(metadata !18, i64 0, metadata !10, metadata !{i32 786690}), !dbg !19
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br label %while.cond, !dbg !20
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while.cond: ; preds = %while.body, %entry
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%0 = phi i32 [ 0, %entry ], [ %inc, %while.body ] ; <i32> [#uses=3]
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%buf.addr.0 = getelementptr i8* %buf, i32 %0 ; <i8*> [#uses=1]
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%cmp7 = icmp ult i32 %0, %nbytes.addr.0, !dbg !20 ; <i1> [#uses=1]
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br i1 %cmp7, label %land.rhs, label %while.end, !dbg !20
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land.rhs: ; preds = %while.cond
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%call = tail call i32 @x1() nounwind optsize, !dbg !20 ; <i32> [#uses=2]
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%cmp9 = icmp eq i32 %call, -1, !dbg !20 ; <i1> [#uses=1]
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br i1 %cmp9, label %while.end, label %while.body, !dbg !20
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while.body: ; preds = %land.rhs
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%conv = trunc i32 %call to i8, !dbg !21 ; <i8> [#uses=1]
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store i8 %conv, i8* %buf.addr.0, !dbg !21
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%inc = add i32 %0, 1, !dbg !23 ; <i32> [#uses=1]
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br label %while.cond, !dbg !24
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while.end: ; preds = %land.rhs, %while.cond
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ret void, !dbg !25
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}
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declare i32 @x1() optsize
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.dbg.lv.fn = !{!0, !8, !10, !12}
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!llvm.dbg.gv = !{!14}
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!0 = metadata !{i32 524545, metadata !1, metadata !"buf", metadata !2, i32 4, metadata !6} ; [ DW_TAG_arg_variable ]
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!1 = metadata !{i32 524334, metadata !26, null, metadata !"x0", metadata !"x0", metadata !"x0", i32 5, metadata !4, i1 false, i1 true, i32 0, i32 0, null, i1 false, i1 false, null, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
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!2 = metadata !{i32 524329, metadata !26} ; [ DW_TAG_file_type ]
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!3 = metadata !{i32 524305, i32 0, i32 12, metadata !"t.c", metadata !".", metadata !"clang 2.0", i1 true, i1 true, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
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!4 = metadata !{i32 524309, metadata !26, metadata !2, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !5, i32 0, null} ; [ DW_TAG_subroutine_type ]
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!5 = metadata !{null}
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!6 = metadata !{i32 524303, metadata !26, metadata !2, metadata !"", i32 0, i64 32, i64 32, i64 0, i32 0, metadata !7} ; [ DW_TAG_pointer_type ]
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!7 = metadata !{i32 524324, metadata !26, metadata !2, metadata !"unsigned char", i32 0, i64 8, i64 8, i64 0, i32 0, i32 8} ; [ DW_TAG_base_type ]
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!8 = metadata !{i32 524545, metadata !1, metadata !"nbytes", metadata !2, i32 4, metadata !9} ; [ DW_TAG_arg_variable ]
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!9 = metadata !{i32 524324, metadata !26, metadata !2, metadata !"unsigned long", i32 0, i64 32, i64 32, i64 0, i32 0, i32 7} ; [ DW_TAG_base_type ]
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!10 = metadata !{i32 524544, metadata !11, metadata !"nread", metadata !2, i32 6, metadata !9} ; [ DW_TAG_auto_variable ]
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!11 = metadata !{i32 524299, metadata !26, metadata !1, i32 5, i32 1, i32 0} ; [ DW_TAG_lexical_block ]
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!12 = metadata !{i32 524544, metadata !11, metadata !"c", metadata !2, i32 7, metadata !13} ; [ DW_TAG_auto_variable ]
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!13 = metadata !{i32 524324, metadata !26, metadata !2, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
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!14 = metadata !{i32 524340, i32 0, metadata !2, metadata !"length", metadata !"length", metadata !"length", metadata !2, i32 1, metadata !13, i1 false, i1 true, i32* @length} ; [ DW_TAG_variable ]
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!15 = metadata !{i32 4, i32 24, metadata !1, null}
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!16 = metadata !{i32 4, i32 43, metadata !1, null}
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!17 = metadata !{i32 9, i32 2, metadata !11, null}
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!18 = metadata !{i32 0}
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!19 = metadata !{i32 10, i32 2, metadata !11, null}
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!20 = metadata !{i32 11, i32 2, metadata !11, null}
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!21 = metadata !{i32 12, i32 3, metadata !22, null}
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!22 = metadata !{i32 524299, metadata !26, metadata !11, i32 11, i32 45, i32 0} ; [ DW_TAG_lexical_block ]
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!23 = metadata !{i32 13, i32 3, metadata !22, null}
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!24 = metadata !{i32 14, i32 2, metadata !22, null}
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!25 = metadata !{i32 15, i32 1, metadata !11, null}
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!26 = metadata !{metadata !"t.c", metadata !"/private/tmp"}
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