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aa69a484eb0774d1b00107bc145bf46c0f871256
carbon-lang/toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
T
Richard SmithDana JansensChandler Carruth
 aa69a484eb Add support for running LLVM optimizer. (#6225) 
Adds a flag `--optimize=<mode>` that specifies what to optimize for:

* `--optimize=none` turns off the optimizer as much as possible, but
still respects always_inline.
* `--optimize=debug` aims to be the equivalent of `-Og` / `-O1`, and
provides optimizations that don't affect the ability to debug the
program. This is the default.
* `--optimize=size` optimizes for the size of the produced program, and
aims to be the equivalent of `-Oz`.
* `--optimize=speed` optimizes for the execution time of the produced
program, and aims to be the equivalent of `-O3`.

Following the approach taken by Clang, the optimization level feeds into
both the configuration of the LLVM pass pipeline and the attributes
added to function definitions generated by the frontend.

Optimization is performed in a new phase, `optimize`, which runs between
`lower` and `codegen`.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
2025-11-05 00:15:14 +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_basic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
class C {
impl as Core.Copy {
fn Op[self: Self]() -> Self { return {}; }
}
}
// The two specifics for recursive function F, when T is a pointer, could be
// deduplicated.
fn F[T:! Core.Copy](x: T, count: i32) -> T {
if (count > 0) {
return x;
}
return F(x, count + 1);
}
fn M() {
var n: i32 = 0;
var m: f64 = 1.0;
var ptr_i32 : i32*;
var ptr_f64 : f64*;
F(n, 0);
F(m, 0);
F(ptr_i32, 0);
F(ptr_f64, 0);
var c: C;
F(c, 0);
}
// CHECK:STDOUT: ; ModuleID = 'call_recursive_basic.carbon'
// CHECK:STDOUT: source_filename = "call_recursive_basic.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @C.val.loc15_44 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_COp.C.Main:Copy.Core"(ptr sret({}) %return, ptr %self) #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %return, ptr align 1 @C.val.loc15_44, i64 0, i1 false), !dbg !7
// CHECK:STDOUT: ret void, !dbg !7
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CM.Main() #0 !dbg !8 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !9
// CHECK:STDOUT: %m.var = alloca double, align 8, !dbg !10
// CHECK:STDOUT: %ptr_i32.var = alloca ptr, align 8, !dbg !11
// CHECK:STDOUT: %ptr_f64.var = alloca ptr, align 8, !dbg !12
// CHECK:STDOUT: %c.var = alloca {}, align 8, !dbg !13
// CHECK:STDOUT: %.loc40_9.5.temp = alloca {}, align 8, !dbg !14
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !9
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !9
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %m.var), !dbg !10
// CHECK:STDOUT: store double 1.000000e+00, ptr %m.var, align 8, !dbg !10
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !11
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !12
// CHECK:STDOUT: %.loc34_5 = load i32, ptr %n.var, align 4, !dbg !15
// CHECK:STDOUT: %F.call.loc34 = call i32 @_CF.Main.5450dc8e8b8e0899(i32 %.loc34_5, i32 0), !dbg !16
// CHECK:STDOUT: %.loc35_5 = load double, ptr %m.var, align 8, !dbg !17
// CHECK:STDOUT: %F.call.loc35 = call double @_CF.Main.83aece103b0a8681(double %.loc35_5, i32 0), !dbg !18
// CHECK:STDOUT: %.loc36_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !19
// CHECK:STDOUT: %F.call.loc36 = call ptr @_CF.Main.0a952f8bcc623ce6(ptr %.loc36_5, i32 0), !dbg !20
// CHECK:STDOUT: %.loc37_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !21
// CHECK:STDOUT: %F.call.loc37 = call ptr @_CF.Main.0a952f8bcc623ce6(ptr %.loc37_5, i32 0), !dbg !22
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !13
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc40_9.5.temp), !dbg !14
// CHECK:STDOUT: call void @_CF.Main.936d996ea935415c(ptr %.loc40_9.5.temp, ptr %c.var, i32 0), !dbg !14
// CHECK:STDOUT: ret void, !dbg !23
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CF.Main.5450dc8e8b8e0899(i32 %x, i32 %count) #0 !dbg !24 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !25
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !26
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret i32 %x, !dbg !27
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !28
// CHECK:STDOUT: %F.call = call i32 @_CF.Main.5450dc8e8b8e0899(i32 %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !29
// CHECK:STDOUT: ret i32 %F.call, !dbg !30
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr double @_CF.Main.83aece103b0a8681(double %x, i32 %count) #0 !dbg !31 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !32
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !33
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret double %x, !dbg !34
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !35
// CHECK:STDOUT: %F.call = call double @_CF.Main.83aece103b0a8681(double %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !36
// CHECK:STDOUT: ret double %F.call, !dbg !37
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @_CF.Main.0a952f8bcc623ce6(ptr %x, i32 %count) #0 !dbg !38 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !39
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !40
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret ptr %x, !dbg !41
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !42
// CHECK:STDOUT: %F.call = call ptr @_CF.Main.0a952f8bcc623ce6(ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !43
// CHECK:STDOUT: ret ptr %F.call, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CF.Main.936d996ea935415c(ptr sret({}) %return, ptr %x, i32 %count) #0 !dbg !45 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !46
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !47
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: call void @"_COp.C.Main:Copy.Core"(ptr %return, ptr %x), !dbg !48
// CHECK:STDOUT: ret void, !dbg !49
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !50
// CHECK:STDOUT: call void @_CF.Main.936d996ea935415c(ptr %return, ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !51
// CHECK:STDOUT: ret void, !dbg !52
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 5, 4, 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CF.Main.0a952f8bcc623ce6, { 1, 2, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { 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_basic.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Op", linkageName: "_COp.C.Main:Copy.Core", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 15, column: 35, scope: !4)
// CHECK:STDOUT: !8 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 28, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !9 = !DILocation(line: 29, column: 3, scope: !8)
// CHECK:STDOUT: !10 = !DILocation(line: 30, column: 3, scope: !8)
// CHECK:STDOUT: !11 = !DILocation(line: 31, column: 3, scope: !8)
// CHECK:STDOUT: !12 = !DILocation(line: 32, column: 3, scope: !8)
// CHECK:STDOUT: !13 = !DILocation(line: 39, column: 3, scope: !8)
// CHECK:STDOUT: !14 = !DILocation(line: 40, column: 3, scope: !8)
// CHECK:STDOUT: !15 = !DILocation(line: 34, column: 5, scope: !8)
// CHECK:STDOUT: !16 = !DILocation(line: 34, column: 3, scope: !8)
// CHECK:STDOUT: !17 = !DILocation(line: 35, column: 5, scope: !8)
// CHECK:STDOUT: !18 = !DILocation(line: 35, column: 3, scope: !8)
// CHECK:STDOUT: !19 = !DILocation(line: 36, column: 5, scope: !8)
// CHECK:STDOUT: !20 = !DILocation(line: 36, column: 3, scope: !8)
// CHECK:STDOUT: !21 = !DILocation(line: 37, column: 5, scope: !8)
// CHECK:STDOUT: !22 = !DILocation(line: 37, column: 3, scope: !8)
// CHECK:STDOUT: !23 = !DILocation(line: 28, column: 1, scope: !8)
// CHECK:STDOUT: !24 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.5450dc8e8b8e0899", scope: null, file: !3, line: 21, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !25 = !DILocation(line: 22, column: 7, scope: !24)
// CHECK:STDOUT: !26 = !DILocation(line: 22, column: 6, scope: !24)
// CHECK:STDOUT: !27 = !DILocation(line: 23, column: 5, scope: !24)
// CHECK:STDOUT: !28 = !DILocation(line: 25, column: 15, scope: !24)
// CHECK:STDOUT: !29 = !DILocation(line: 25, column: 10, scope: !24)
// CHECK:STDOUT: !30 = !DILocation(line: 25, column: 3, scope: !24)
// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.83aece103b0a8681", scope: null, file: !3, line: 21, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !32 = !DILocation(line: 22, column: 7, scope: !31)
// CHECK:STDOUT: !33 = !DILocation(line: 22, column: 6, scope: !31)
// CHECK:STDOUT: !34 = !DILocation(line: 23, column: 5, scope: !31)
// CHECK:STDOUT: !35 = !DILocation(line: 25, column: 15, scope: !31)
// CHECK:STDOUT: !36 = !DILocation(line: 25, column: 10, scope: !31)
// CHECK:STDOUT: !37 = !DILocation(line: 25, column: 3, scope: !31)
// CHECK:STDOUT: !38 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.0a952f8bcc623ce6", scope: null, file: !3, line: 21, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !39 = !DILocation(line: 22, column: 7, scope: !38)
// CHECK:STDOUT: !40 = !DILocation(line: 22, column: 6, scope: !38)
// CHECK:STDOUT: !41 = !DILocation(line: 23, column: 5, scope: !38)
// CHECK:STDOUT: !42 = !DILocation(line: 25, column: 15, scope: !38)
// CHECK:STDOUT: !43 = !DILocation(line: 25, column: 10, scope: !38)
// CHECK:STDOUT: !44 = !DILocation(line: 25, column: 3, scope: !38)
// CHECK:STDOUT: !45 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.936d996ea935415c", scope: null, file: !3, line: 21, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !46 = !DILocation(line: 22, column: 7, scope: !45)
// CHECK:STDOUT: !47 = !DILocation(line: 22, column: 6, scope: !45)
// CHECK:STDOUT: !48 = !DILocation(line: 23, column: 12, scope: !45)
// CHECK:STDOUT: !49 = !DILocation(line: 23, column: 5, scope: !45)
// CHECK:STDOUT: !50 = !DILocation(line: 25, column: 15, scope: !45)
// CHECK:STDOUT: !51 = !DILocation(line: 25, column: 10, scope: !45)
// CHECK:STDOUT: !52 = !DILocation(line: 25, column: 3, scope: !45)
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