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carbon-lang/toolchain/lower/testdata/function/generic/call_recursive_sccs_deep.carbon
T
Jon Ross-Perkins 7ccc1e0144 Expand naming for impls and functions (#5808) 
Change impls from `<interface>.impl` to `<self>.as.<interface>.impl`,
and *member* functions to `<parent scope>.<fn>` (non-member functions
exclude their parent scope). Stop special-casing builtin functions,
given the new naming scheme.

The purpose of this is to make it clearer when a member function is
being accessed and, if so, which member function. In particular, we
often access interface `Op` functions. The builtin function
special-casing was intended to help with that, but we still have lots of
`Op` functions. This particular approach should make the interactions
clearer.

This changes up queueing of block IDs a little because, in particular,
we need to process bodies of entities only after constants finish
processing. But, it should also result in less memory usage during
processing because it means we have less on the insts stack at any given
time, since we track a block rather than all instructions contained by
the block.
2025-07-21 18:45:07 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/call_recursive_sccs_deep.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_recursive_sccs_deep.carbon
import Core library "io";
fn A[T:! type](x: T, count: i32) -> T;
fn B[T:! type](x: T, count: i32);
fn C[T:! type](x: T, count: i32);
fn D[T:! type](x: T, count: i32) -> T;
fn E[T:! type](x: T, count: i32) -> T;
fn F[T:! type](x: T, count: i32) -> T;
// Builds on `call_recursive_mutual.carbon` and `call_recursive_diamond.carbon`
// B-C form a mutually recursive SCC (strongly connected component), D-E-F-G
// form a diamond SCC.
// The two specifics for each of A, B, C, D, E, F, G with a pointer type could
// be deduplicated.
// E and F are also equivalent in the diamond, even though they are different
// generics. There is potential front-end ICF (identical code folding)
// optimization here, if the function fingerprint may infer deduplication
// when not including the two different generic_ids.
fn A[T:! type](x: T, count: i32) -> T {
B(x, count);
return D(x, count);
}
fn B[T:! type](x: T, count: i32) {
C(x, count);
}
fn C[T:! type](x: T, count: i32) {
if (count <= 2) {
Core.Print(count);
B(x, count + 1);
}
}
fn D[T:! type](x: T, count: i32) -> T {
if (count > 4) {
return x;
}
if (count % 2 == 0) {
return E(x, count);
} else {
return F(x, count);
}
}
fn G[T:! type](x: T, count: i32) -> T;
fn E[T:! type](x: T, count: i32) -> T {
return G(x, count);
}
fn F[T:! type](x: T, count: i32) -> T {
return G(x, count);
}
fn G[T:! type](x: T, count: i32) -> T {
return D(x, count + 1);
}
fn M() {
var n: i32 = 0;
var m: f64 = 1.0;
var ptr_i32 : i32*;
var ptr_f64 : f64*;
A(n, 0);
A(m, 0);
A(ptr_i32, 0);
A(ptr_f64, 0);
}
// CHECK:STDOUT: ; ModuleID = 'call_recursive_sccs_deep.carbon'
// CHECK:STDOUT: source_filename = "call_recursive_sccs_deep.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @printf.int.format = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CM.Main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !7
// CHECK:STDOUT: %m.var = alloca double, align 8, !dbg !8
// CHECK:STDOUT: %ptr_i32.var = alloca ptr, align 8, !dbg !9
// CHECK:STDOUT: %ptr_f64.var = alloca ptr, align 8, !dbg !10
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 4, ptr %n.var), !dbg !7
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 8, ptr %m.var), !dbg !8
// CHECK:STDOUT: store double 1.000000e+00, ptr %m.var, align 8, !dbg !8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 8, ptr %ptr_i32.var), !dbg !9
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 8, ptr %ptr_f64.var), !dbg !10
// CHECK:STDOUT: %.loc79_5 = load i32, ptr %n.var, align 4, !dbg !11
// CHECK:STDOUT: %A.call.loc79 = call i32 @_CA.Main.b88d1103f417c6d4(i32 %.loc79_5, i32 0), !dbg !12
// CHECK:STDOUT: %.loc80_5 = load double, ptr %m.var, align 8, !dbg !13
// CHECK:STDOUT: %A.call.loc80 = call double @_CA.Main.66be507887ceee78(double %.loc80_5, i32 0), !dbg !14
// CHECK:STDOUT: %.loc81_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !15
// CHECK:STDOUT: %A.call.loc81 = call ptr @_CA.Main.e8193710fd35b608(ptr %.loc81_5, i32 0), !dbg !16
// CHECK:STDOUT: %.loc82_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !17
// CHECK:STDOUT: %A.call.loc82 = call ptr @_CA.Main.e8193710fd35b608(ptr %.loc82_5, i32 0), !dbg !18
// CHECK:STDOUT: ret void, !dbg !19
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(i64 immarg, ptr captures(none)) #0
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr i32 @_CA.Main.b88d1103f417c6d4(i32 %x, i32 %count) !dbg !20 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CB.Main.b88d1103f417c6d4(i32 %x, i32 %count), !dbg !21
// CHECK:STDOUT: %D.call = call i32 @_CD.Main.b88d1103f417c6d4(i32 %x, i32 %count), !dbg !22
// CHECK:STDOUT: ret i32 %D.call, !dbg !23
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr double @_CA.Main.66be507887ceee78(double %x, i32 %count) !dbg !24 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CB.Main.66be507887ceee78(double %x, i32 %count), !dbg !25
// CHECK:STDOUT: %D.call = call double @_CD.Main.66be507887ceee78(double %x, i32 %count), !dbg !26
// CHECK:STDOUT: ret double %D.call, !dbg !27
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr ptr @_CA.Main.e8193710fd35b608(ptr %x, i32 %count) !dbg !28 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CB.Main.e8193710fd35b608(ptr %x, i32 %count), !dbg !29
// CHECK:STDOUT: %D.call = call ptr @_CD.Main.e8193710fd35b608(ptr %x, i32 %count), !dbg !30
// CHECK:STDOUT: ret ptr %D.call, !dbg !31
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr void @_CB.Main.b88d1103f417c6d4(i32 %x, i32 %count) !dbg !32 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CC.Main.b88d1103f417c6d4(i32 %x, i32 %count), !dbg !33
// CHECK:STDOUT: ret void, !dbg !34
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr i32 @_CD.Main.b88d1103f417c6d4(i32 %x, i32 %count) !dbg !35 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 4, !dbg !36
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then.loc48, label %if.else.loc48, !dbg !37
// CHECK:STDOUT:
// CHECK:STDOUT: if.then.loc48: ; preds = %entry
// CHECK:STDOUT: ret i32 %x, !dbg !38
// CHECK:STDOUT:
// CHECK:STDOUT: if.else.loc48: ; preds = %entry
// CHECK:STDOUT: %Int.as.ModWith.impl.Op.call = srem i32 %count, 2, !dbg !39
// CHECK:STDOUT: %Int.as.EqWith.impl.Equal.call = icmp eq i32 %Int.as.ModWith.impl.Op.call, 0, !dbg !39
// CHECK:STDOUT: br i1 %Int.as.EqWith.impl.Equal.call, label %if.then.loc51, label %if.else.loc51, !dbg !40
// CHECK:STDOUT:
// CHECK:STDOUT: if.then.loc51: ; preds = %if.else.loc48
// CHECK:STDOUT: %E.call = call i32 @_CE.Main.b88d1103f417c6d4(i32 %x, i32 %count), !dbg !41
// CHECK:STDOUT: ret i32 %E.call, !dbg !42
// CHECK:STDOUT:
// CHECK:STDOUT: if.else.loc51: ; preds = %if.else.loc48
// CHECK:STDOUT: %F.call = call i32 @_CF.Main.b88d1103f417c6d4(i32 %x, i32 %count), !dbg !43
// CHECK:STDOUT: ret i32 %F.call, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr void @_CB.Main.66be507887ceee78(double %x, i32 %count) !dbg !45 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CC.Main.66be507887ceee78(double %x, i32 %count), !dbg !46
// CHECK:STDOUT: ret void, !dbg !47
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr double @_CD.Main.66be507887ceee78(double %x, i32 %count) !dbg !48 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 4, !dbg !49
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then.loc48, label %if.else.loc48, !dbg !50
// CHECK:STDOUT:
// CHECK:STDOUT: if.then.loc48: ; preds = %entry
// CHECK:STDOUT: ret double %x, !dbg !51
// CHECK:STDOUT:
// CHECK:STDOUT: if.else.loc48: ; preds = %entry
// CHECK:STDOUT: %Int.as.ModWith.impl.Op.call = srem i32 %count, 2, !dbg !52
// CHECK:STDOUT: %Int.as.EqWith.impl.Equal.call = icmp eq i32 %Int.as.ModWith.impl.Op.call, 0, !dbg !52
// CHECK:STDOUT: br i1 %Int.as.EqWith.impl.Equal.call, label %if.then.loc51, label %if.else.loc51, !dbg !53
// CHECK:STDOUT:
// CHECK:STDOUT: if.then.loc51: ; preds = %if.else.loc48
// CHECK:STDOUT: %E.call = call double @_CE.Main.66be507887ceee78(double %x, i32 %count), !dbg !54
// CHECK:STDOUT: ret double %E.call, !dbg !55
// CHECK:STDOUT:
// CHECK:STDOUT: if.else.loc51: ; preds = %if.else.loc48
// CHECK:STDOUT: %F.call = call double @_CF.Main.66be507887ceee78(double %x, i32 %count), !dbg !56
// CHECK:STDOUT: ret double %F.call, !dbg !57
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr void @_CB.Main.e8193710fd35b608(ptr %x, i32 %count) !dbg !58 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CC.Main.e8193710fd35b608(ptr %x, i32 %count), !dbg !59
// CHECK:STDOUT: ret void, !dbg !60
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr ptr @_CD.Main.e8193710fd35b608(ptr %x, i32 %count) !dbg !61 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 4, !dbg !62
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then.loc48, label %if.else.loc48, !dbg !63
// CHECK:STDOUT:
// CHECK:STDOUT: if.then.loc48: ; preds = %entry
// CHECK:STDOUT: ret ptr %x, !dbg !64
// CHECK:STDOUT:
// CHECK:STDOUT: if.else.loc48: ; preds = %entry
// CHECK:STDOUT: %Int.as.ModWith.impl.Op.call = srem i32 %count, 2, !dbg !65
// CHECK:STDOUT: %Int.as.EqWith.impl.Equal.call = icmp eq i32 %Int.as.ModWith.impl.Op.call, 0, !dbg !65
// CHECK:STDOUT: br i1 %Int.as.EqWith.impl.Equal.call, label %if.then.loc51, label %if.else.loc51, !dbg !66
// CHECK:STDOUT:
// CHECK:STDOUT: if.then.loc51: ; preds = %if.else.loc48
// CHECK:STDOUT: %E.call = call ptr @_CE.Main.e8193710fd35b608(ptr %x, i32 %count), !dbg !67
// CHECK:STDOUT: ret ptr %E.call, !dbg !68
// CHECK:STDOUT:
// CHECK:STDOUT: if.else.loc51: ; preds = %if.else.loc48
// CHECK:STDOUT: %F.call = call ptr @_CF.Main.e8193710fd35b608(ptr %x, i32 %count), !dbg !69
// CHECK:STDOUT: ret ptr %F.call, !dbg !70
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr void @_CC.Main.b88d1103f417c6d4(i32 %x, i32 %count) !dbg !71 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.LessOrEquivalent.call = icmp sle i32 %count, 2, !dbg !72
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.LessOrEquivalent.call, label %if.then, label %if.else, !dbg !73
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: %Print.call = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 %count), !dbg !74
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !75
// CHECK:STDOUT: call void @_CB.Main.b88d1103f417c6d4(i32 %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !76
// CHECK:STDOUT: br label %if.else, !dbg !77
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %if.then, %entry
// CHECK:STDOUT: ret void, !dbg !78
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr i32 @_CE.Main.b88d1103f417c6d4(i32 %x, i32 %count) !dbg !79 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.b88d1103f417c6d4(i32 %x, i32 %count), !dbg !80
// CHECK:STDOUT: ret i32 %G.call, !dbg !81
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr i32 @_CF.Main.b88d1103f417c6d4(i32 %x, i32 %count) !dbg !82 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.b88d1103f417c6d4(i32 %x, i32 %count), !dbg !83
// CHECK:STDOUT: ret i32 %G.call, !dbg !84
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr void @_CC.Main.66be507887ceee78(double %x, i32 %count) !dbg !85 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.LessOrEquivalent.call = icmp sle i32 %count, 2, !dbg !86
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.LessOrEquivalent.call, label %if.then, label %if.else, !dbg !87
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: %Print.call = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 %count), !dbg !88
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !89
// CHECK:STDOUT: call void @_CB.Main.66be507887ceee78(double %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !90
// CHECK:STDOUT: br label %if.else, !dbg !91
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %if.then, %entry
// CHECK:STDOUT: ret void, !dbg !92
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr double @_CE.Main.66be507887ceee78(double %x, i32 %count) !dbg !93 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call = call double @_CG.Main.66be507887ceee78(double %x, i32 %count), !dbg !94
// CHECK:STDOUT: ret double %G.call, !dbg !95
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr double @_CF.Main.66be507887ceee78(double %x, i32 %count) !dbg !96 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call = call double @_CG.Main.66be507887ceee78(double %x, i32 %count), !dbg !97
// CHECK:STDOUT: ret double %G.call, !dbg !98
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr void @_CC.Main.e8193710fd35b608(ptr %x, i32 %count) !dbg !99 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.LessOrEquivalent.call = icmp sle i32 %count, 2, !dbg !100
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.LessOrEquivalent.call, label %if.then, label %if.else, !dbg !101
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: %Print.call = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 %count), !dbg !102
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !103
// CHECK:STDOUT: call void @_CB.Main.e8193710fd35b608(ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !104
// CHECK:STDOUT: br label %if.else, !dbg !105
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %if.then, %entry
// CHECK:STDOUT: ret void, !dbg !106
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr ptr @_CE.Main.e8193710fd35b608(ptr %x, i32 %count) !dbg !107 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call = call ptr @_CG.Main.e8193710fd35b608(ptr %x, i32 %count), !dbg !108
// CHECK:STDOUT: ret ptr %G.call, !dbg !109
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr ptr @_CF.Main.e8193710fd35b608(ptr %x, i32 %count) !dbg !110 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call = call ptr @_CG.Main.e8193710fd35b608(ptr %x, i32 %count), !dbg !111
// CHECK:STDOUT: ret ptr %G.call, !dbg !112
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare i32 @printf(ptr, ...)
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.b88d1103f417c6d4(i32 %x, i32 %count) !dbg !113 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !114
// CHECK:STDOUT: %D.call = call i32 @_CD.Main.b88d1103f417c6d4(i32 %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !115
// CHECK:STDOUT: ret i32 %D.call, !dbg !116
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr double @_CG.Main.66be507887ceee78(double %x, i32 %count) !dbg !117 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !118
// CHECK:STDOUT: %D.call = call double @_CD.Main.66be507887ceee78(double %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !119
// CHECK:STDOUT: ret double %D.call, !dbg !120
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr ptr @_CG.Main.e8193710fd35b608(ptr %x, i32 %count) !dbg !121 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !122
// CHECK:STDOUT: %D.call = call ptr @_CD.Main.e8193710fd35b608(ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !123
// CHECK:STDOUT: ret ptr %D.call, !dbg !124
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CA.Main.e8193710fd35b608, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @printf, { 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CG.Main.b88d1103f417c6d4, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CG.Main.66be507887ceee78, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CG.Main.e8193710fd35b608, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "call_recursive_sccs_deep.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 73, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 74, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 75, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 76, column: 3, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 77, column: 3, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 79, column: 5, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 79, column: 3, scope: !4)
// CHECK:STDOUT: !13 = !DILocation(line: 80, column: 5, scope: !4)
// CHECK:STDOUT: !14 = !DILocation(line: 80, column: 3, scope: !4)
// CHECK:STDOUT: !15 = !DILocation(line: 81, column: 5, scope: !4)
// CHECK:STDOUT: !16 = !DILocation(line: 81, column: 3, scope: !4)
// CHECK:STDOUT: !17 = !DILocation(line: 82, column: 5, scope: !4)
// CHECK:STDOUT: !18 = !DILocation(line: 82, column: 3, scope: !4)
// CHECK:STDOUT: !19 = !DILocation(line: 73, column: 1, scope: !4)
// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "A", linkageName: "_CA.Main.b88d1103f417c6d4", scope: null, file: !3, line: 31, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !21 = !DILocation(line: 32, column: 3, scope: !20)
// CHECK:STDOUT: !22 = !DILocation(line: 33, column: 10, scope: !20)
// CHECK:STDOUT: !23 = !DILocation(line: 33, column: 3, scope: !20)
// CHECK:STDOUT: !24 = distinct !DISubprogram(name: "A", linkageName: "_CA.Main.66be507887ceee78", scope: null, file: !3, line: 31, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !25 = !DILocation(line: 32, column: 3, scope: !24)
// CHECK:STDOUT: !26 = !DILocation(line: 33, column: 10, scope: !24)
// CHECK:STDOUT: !27 = !DILocation(line: 33, column: 3, scope: !24)
// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "A", linkageName: "_CA.Main.e8193710fd35b608", scope: null, file: !3, line: 31, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !29 = !DILocation(line: 32, column: 3, scope: !28)
// CHECK:STDOUT: !30 = !DILocation(line: 33, column: 10, scope: !28)
// CHECK:STDOUT: !31 = !DILocation(line: 33, column: 3, scope: !28)
// CHECK:STDOUT: !32 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.b88d1103f417c6d4", scope: null, file: !3, line: 36, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !33 = !DILocation(line: 37, column: 3, scope: !32)
// CHECK:STDOUT: !34 = !DILocation(line: 36, column: 1, scope: !32)
// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.b88d1103f417c6d4", scope: null, file: !3, line: 47, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !36 = !DILocation(line: 48, column: 7, scope: !35)
// CHECK:STDOUT: !37 = !DILocation(line: 48, column: 6, scope: !35)
// CHECK:STDOUT: !38 = !DILocation(line: 49, column: 5, scope: !35)
// CHECK:STDOUT: !39 = !DILocation(line: 51, column: 7, scope: !35)
// CHECK:STDOUT: !40 = !DILocation(line: 51, column: 6, scope: !35)
// CHECK:STDOUT: !41 = !DILocation(line: 52, column: 12, scope: !35)
// CHECK:STDOUT: !42 = !DILocation(line: 52, column: 5, scope: !35)
// CHECK:STDOUT: !43 = !DILocation(line: 54, column: 12, scope: !35)
// CHECK:STDOUT: !44 = !DILocation(line: 54, column: 5, scope: !35)
// CHECK:STDOUT: !45 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.66be507887ceee78", scope: null, file: !3, line: 36, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !46 = !DILocation(line: 37, column: 3, scope: !45)
// CHECK:STDOUT: !47 = !DILocation(line: 36, column: 1, scope: !45)
// CHECK:STDOUT: !48 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.66be507887ceee78", scope: null, file: !3, line: 47, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !49 = !DILocation(line: 48, column: 7, scope: !48)
// CHECK:STDOUT: !50 = !DILocation(line: 48, column: 6, scope: !48)
// CHECK:STDOUT: !51 = !DILocation(line: 49, column: 5, scope: !48)
// CHECK:STDOUT: !52 = !DILocation(line: 51, column: 7, scope: !48)
// CHECK:STDOUT: !53 = !DILocation(line: 51, column: 6, scope: !48)
// CHECK:STDOUT: !54 = !DILocation(line: 52, column: 12, scope: !48)
// CHECK:STDOUT: !55 = !DILocation(line: 52, column: 5, scope: !48)
// CHECK:STDOUT: !56 = !DILocation(line: 54, column: 12, scope: !48)
// CHECK:STDOUT: !57 = !DILocation(line: 54, column: 5, scope: !48)
// CHECK:STDOUT: !58 = distinct !DISubprogram(name: "B", linkageName: "_CB.Main.e8193710fd35b608", scope: null, file: !3, line: 36, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !59 = !DILocation(line: 37, column: 3, scope: !58)
// CHECK:STDOUT: !60 = !DILocation(line: 36, column: 1, scope: !58)
// CHECK:STDOUT: !61 = distinct !DISubprogram(name: "D", linkageName: "_CD.Main.e8193710fd35b608", scope: null, file: !3, line: 47, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !62 = !DILocation(line: 48, column: 7, scope: !61)
// CHECK:STDOUT: !63 = !DILocation(line: 48, column: 6, scope: !61)
// CHECK:STDOUT: !64 = !DILocation(line: 49, column: 5, scope: !61)
// CHECK:STDOUT: !65 = !DILocation(line: 51, column: 7, scope: !61)
// CHECK:STDOUT: !66 = !DILocation(line: 51, column: 6, scope: !61)
// CHECK:STDOUT: !67 = !DILocation(line: 52, column: 12, scope: !61)
// CHECK:STDOUT: !68 = !DILocation(line: 52, column: 5, scope: !61)
// CHECK:STDOUT: !69 = !DILocation(line: 54, column: 12, scope: !61)
// CHECK:STDOUT: !70 = !DILocation(line: 54, column: 5, scope: !61)
// CHECK:STDOUT: !71 = distinct !DISubprogram(name: "C", linkageName: "_CC.Main.b88d1103f417c6d4", scope: null, file: !3, line: 40, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !72 = !DILocation(line: 41, column: 7, scope: !71)
// CHECK:STDOUT: !73 = !DILocation(line: 41, column: 6, scope: !71)
// CHECK:STDOUT: !74 = !DILocation(line: 42, column: 5, scope: !71)
// CHECK:STDOUT: !75 = !DILocation(line: 43, column: 10, scope: !71)
// CHECK:STDOUT: !76 = !DILocation(line: 43, column: 5, scope: !71)
// CHECK:STDOUT: !77 = !DILocation(line: 41, column: 3, scope: !71)
// CHECK:STDOUT: !78 = !DILocation(line: 40, column: 1, scope: !71)
// CHECK:STDOUT: !79 = distinct !DISubprogram(name: "E", linkageName: "_CE.Main.b88d1103f417c6d4", scope: null, file: !3, line: 60, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !80 = !DILocation(line: 61, column: 10, scope: !79)
// CHECK:STDOUT: !81 = !DILocation(line: 61, column: 3, scope: !79)
// CHECK:STDOUT: !82 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.b88d1103f417c6d4", scope: null, file: !3, line: 64, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !83 = !DILocation(line: 65, column: 10, scope: !82)
// CHECK:STDOUT: !84 = !DILocation(line: 65, column: 3, scope: !82)
// CHECK:STDOUT: !85 = distinct !DISubprogram(name: "C", linkageName: "_CC.Main.66be507887ceee78", scope: null, file: !3, line: 40, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !86 = !DILocation(line: 41, column: 7, scope: !85)
// CHECK:STDOUT: !87 = !DILocation(line: 41, column: 6, scope: !85)
// CHECK:STDOUT: !88 = !DILocation(line: 42, column: 5, scope: !85)
// CHECK:STDOUT: !89 = !DILocation(line: 43, column: 10, scope: !85)
// CHECK:STDOUT: !90 = !DILocation(line: 43, column: 5, scope: !85)
// CHECK:STDOUT: !91 = !DILocation(line: 41, column: 3, scope: !85)
// CHECK:STDOUT: !92 = !DILocation(line: 40, column: 1, scope: !85)
// CHECK:STDOUT: !93 = distinct !DISubprogram(name: "E", linkageName: "_CE.Main.66be507887ceee78", scope: null, file: !3, line: 60, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !94 = !DILocation(line: 61, column: 10, scope: !93)
// CHECK:STDOUT: !95 = !DILocation(line: 61, column: 3, scope: !93)
// CHECK:STDOUT: !96 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.66be507887ceee78", scope: null, file: !3, line: 64, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !97 = !DILocation(line: 65, column: 10, scope: !96)
// CHECK:STDOUT: !98 = !DILocation(line: 65, column: 3, scope: !96)
// CHECK:STDOUT: !99 = distinct !DISubprogram(name: "C", linkageName: "_CC.Main.e8193710fd35b608", scope: null, file: !3, line: 40, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !100 = !DILocation(line: 41, column: 7, scope: !99)
// CHECK:STDOUT: !101 = !DILocation(line: 41, column: 6, scope: !99)
// CHECK:STDOUT: !102 = !DILocation(line: 42, column: 5, scope: !99)
// CHECK:STDOUT: !103 = !DILocation(line: 43, column: 10, scope: !99)
// CHECK:STDOUT: !104 = !DILocation(line: 43, column: 5, scope: !99)
// CHECK:STDOUT: !105 = !DILocation(line: 41, column: 3, scope: !99)
// CHECK:STDOUT: !106 = !DILocation(line: 40, column: 1, scope: !99)
// CHECK:STDOUT: !107 = distinct !DISubprogram(name: "E", linkageName: "_CE.Main.e8193710fd35b608", scope: null, file: !3, line: 60, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !108 = !DILocation(line: 61, column: 10, scope: !107)
// CHECK:STDOUT: !109 = !DILocation(line: 61, column: 3, scope: !107)
// CHECK:STDOUT: !110 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.e8193710fd35b608", scope: null, file: !3, line: 64, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !111 = !DILocation(line: 65, column: 10, scope: !110)
// CHECK:STDOUT: !112 = !DILocation(line: 65, column: 3, scope: !110)
// CHECK:STDOUT: !113 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.b88d1103f417c6d4", scope: null, file: !3, line: 68, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !114 = !DILocation(line: 69, column: 15, scope: !113)
// CHECK:STDOUT: !115 = !DILocation(line: 69, column: 10, scope: !113)
// CHECK:STDOUT: !116 = !DILocation(line: 69, column: 3, scope: !113)
// CHECK:STDOUT: !117 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.66be507887ceee78", scope: null, file: !3, line: 68, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !118 = !DILocation(line: 69, column: 15, scope: !117)
// CHECK:STDOUT: !119 = !DILocation(line: 69, column: 10, scope: !117)
// CHECK:STDOUT: !120 = !DILocation(line: 69, column: 3, scope: !117)
// CHECK:STDOUT: !121 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.e8193710fd35b608", scope: null, file: !3, line: 68, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !122 = !DILocation(line: 69, column: 15, scope: !121)
// CHECK:STDOUT: !123 = !DILocation(line: 69, column: 10, scope: !121)
// CHECK:STDOUT: !124 = !DILocation(line: 69, column: 3, scope: !121)
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