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f47aa4d47f
1- Use the line_iterator class to read profile files. 2- Allow comments in profile file. Lines starting with '#' are completely ignored while reading the profile. 3- Add parsing support for discriminators and indirect call samples. Our external profiler can emit more profile information that we are currently not handling. This patch does not add new functionality to support this information, but it allows profile files to provide it. I will add actual support later on (for at least one of these features, I need support for DWARF discriminators in Clang). A sample line may contain the following additional information: Discriminator. This is used if the sampled program was compiled with DWARF discriminator support (http://wiki.dwarfstd.org/index.php?title=Path_Discriminators). This is currently only emitted by GCC and we just ignore it. Potential call targets and samples. If present, this line contains a call instruction. This models both direct and indirect calls. Each called target is listed together with the number of samples. For example, 130: 7 foo:3 bar:2 baz:7 The above means that at relative line offset 130 there is a call instruction that calls one of foo(), bar() and baz(). With baz() being the relatively more frequent call target. Differential Revision: http://llvm-reviews.chandlerc.com/D2355 4- Simplify format of profile input file. This implements earlier suggestions to simplify the format of the sample profile file. The symbol table is not necessary and function profiles do not need to know the number of samples in advance. Differential Revision: http://llvm-reviews.chandlerc.com/D2419 llvm-svn: 198973
108 lines
4.8 KiB
LLVM
108 lines
4.8 KiB
LLVM
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/calls.prof | opt -analyze -branch-prob | FileCheck %s
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; Original C++ test case
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;
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; #include <stdio.h>
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;
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; int sum(int x, int y) {
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; return x + y;
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; }
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;
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; int main() {
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; int s, i = 0;
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; while (i++ < 20000 * 20000)
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; if (i != 100) s = sum(i, s); else s = 30;
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; printf("sum is %d\n", s);
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; return 0;
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; }
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@.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
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; Function Attrs: nounwind uwtable
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define i32 @_Z3sumii(i32 %x, i32 %y) {
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entry:
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%x.addr = alloca i32, align 4
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%y.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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store i32 %y, i32* %y.addr, align 4
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%0 = load i32* %x.addr, align 4, !dbg !11
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%1 = load i32* %y.addr, align 4, !dbg !11
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%add = add nsw i32 %0, %1, !dbg !11
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ret i32 %add, !dbg !11
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}
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; Function Attrs: uwtable
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define i32 @main() {
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entry:
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%retval = alloca i32, align 4
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%s = alloca i32, align 4
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%i = alloca i32, align 4
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store i32 0, i32* %retval
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store i32 0, i32* %i, align 4, !dbg !12
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br label %while.cond, !dbg !13
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while.cond: ; preds = %if.end, %entry
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%0 = load i32* %i, align 4, !dbg !13
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%inc = add nsw i32 %0, 1, !dbg !13
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store i32 %inc, i32* %i, align 4, !dbg !13
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%cmp = icmp slt i32 %0, 400000000, !dbg !13
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br i1 %cmp, label %while.body, label %while.end, !dbg !13
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; CHECK: edge while.cond -> while.body probability is 11143 / 16696 = 66.7405%
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; CHECK: edge while.cond -> while.end probability is 5553 / 16696 = 33.2595%
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while.body: ; preds = %while.cond
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%1 = load i32* %i, align 4, !dbg !14
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%cmp1 = icmp ne i32 %1, 100, !dbg !14
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br i1 %cmp1, label %if.then, label %if.else, !dbg !14
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; NOTE: These weights are wrong. We currently do not handle multiple
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; control flow paths in the same line. The edge while.body -> if.then
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; should be much heavier than the other one. Support for DWARF
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; discriminators will fix this.
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; CHECK: edge while.body -> if.then probability is 11143 / 22286 = 50%
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; CHECK: edge while.body -> if.else probability is 11143 / 22286 = 50%
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if.then: ; preds = %while.body
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%2 = load i32* %i, align 4, !dbg !14
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%3 = load i32* %s, align 4, !dbg !14
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%call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !14
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store i32 %call, i32* %s, align 4, !dbg !14
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br label %if.end, !dbg !14
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if.else: ; preds = %while.body
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store i32 30, i32* %s, align 4, !dbg !14
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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br label %while.cond, !dbg !14
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while.end: ; preds = %while.cond
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%4 = load i32* %s, align 4, !dbg !16
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%call2 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !16
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ret i32 0, !dbg !17
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}
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declare i32 @printf(i8*, ...)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [./calls.cc] [DW_LANG_C_plus_plus]
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!1 = metadata !{metadata !"calls.cc", metadata !"."}
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!2 = metadata !{i32 0}
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!3 = metadata !{metadata !4, metadata !7}
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!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"sum", metadata !"sum", metadata !"", i32 3, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32, i32)* @_Z3sumii, null, null, metadata !2, i32 3} ; [ DW_TAG_subprogram ] [line 3] [def] [sum]
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!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [./calls.cc]
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!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !2, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!7 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"main", metadata !"main", metadata !"", i32 7, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @main, null, null, metadata !2, i32 7} ; [ DW_TAG_subprogram ] [line 7] [def] [main]
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!8 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
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!9 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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!10 = metadata !{metadata !"clang version 3.5 "}
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!11 = metadata !{i32 4, i32 0, metadata !4, null}
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!12 = metadata !{i32 8, i32 0, metadata !7, null} ; [ DW_TAG_imported_declaration ]
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!13 = metadata !{i32 9, i32 0, metadata !7, null}
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!14 = metadata !{i32 10, i32 0, metadata !15, null}
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!15 = metadata !{i32 786443, metadata !1, metadata !7, i32 10, i32 0, i32 0} ; [ DW_TAG_lexical_block ] [./calls.cc]
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!16 = metadata !{i32 11, i32 0, metadata !7, null}
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!17 = metadata !{i32 12, i32 0, metadata !7, null}
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