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aa69a484eb0774d1b00107bc145bf46c0f871256
carbon-lang/toolchain/lower/testdata/function/generic/call_basic_depth.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/int.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_basic_depth.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_basic_depth.carbon
// Builds on `call_basic.carbon`. Checks definitions are emitted with deeper
// call stack, i.e., when functions can be type checked without looking at the
// specific calling context.
fn F[T:! type](x: T) {
}
fn H[T:! Core.Copy](x: T) -> T {
F(x);
return x;
}
fn G[T:! Core.Copy & Core.Destroy](x: T) -> T {
H(x);
F(x);
return x;
}
fn M() {
var n: i32 = 0;
var m: i32;
F(n);
m = G(n);
}
// CHECK:STDOUT: ; ModuleID = 'call_basic_depth.carbon'
// CHECK:STDOUT: source_filename = "call_basic_depth.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CM.Main() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !7
// CHECK:STDOUT: %m.var = alloca i32, align 4, !dbg !8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(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(ptr %m.var), !dbg !8
// CHECK:STDOUT: %.loc34 = load i32, ptr %n.var, align 4, !dbg !9
// CHECK:STDOUT: call void @_CF.Main.b88d1103f417c6d4(i32 %.loc34), !dbg !10
// CHECK:STDOUT: %.loc35_9 = load i32, ptr %n.var, align 4, !dbg !11
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.d756e33fa3337243(i32 %.loc35_9), !dbg !12
// CHECK:STDOUT: store i32 %G.call, ptr %m.var, align 4, !dbg !13
// CHECK:STDOUT: ret void, !dbg !14
// CHECK:STDOUT: }
// 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)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CF.Main.b88d1103f417c6d4(i32 %x) #0 !dbg !15 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !16
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.d756e33fa3337243(i32 %x) #0 !dbg !17 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc25_6.3.temp = alloca i32, align 4, !dbg !18
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_6.3.temp), !dbg !18
// CHECK:STDOUT: %H.call = call i32 @_CH.Main.5450dc8e8b8e0899(i32 %x), !dbg !18
// CHECK:STDOUT: store i32 %H.call, ptr %.loc25_6.3.temp, align 4, !dbg !18
// CHECK:STDOUT: call void @_CF.Main.b88d1103f417c6d4(i32 %x), !dbg !19
// CHECK:STDOUT: ret i32 %x, !dbg !20
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CH.Main.5450dc8e8b8e0899(i32 %x) #0 !dbg !21 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF.Main.b88d1103f417c6d4(i32 %x), !dbg !22
// CHECK:STDOUT: ret i32 %x, !dbg !23
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 2, 1 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { 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_basic_depth.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 30, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 31, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 32, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 34, column: 5, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 34, column: 3, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 35, column: 9, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 35, column: 7, scope: !4)
// CHECK:STDOUT: !13 = !DILocation(line: 35, column: 3, scope: !4)
// CHECK:STDOUT: !14 = !DILocation(line: 30, column: 1, scope: !4)
// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.b88d1103f417c6d4", scope: null, file: !3, line: 16, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !16 = !DILocation(line: 16, column: 1, scope: !15)
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.d756e33fa3337243", scope: null, file: !3, line: 24, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !18 = !DILocation(line: 25, column: 3, scope: !17)
// CHECK:STDOUT: !19 = !DILocation(line: 26, column: 3, scope: !17)
// CHECK:STDOUT: !20 = !DILocation(line: 27, column: 3, scope: !17)
// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.5450dc8e8b8e0899", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !22 = !DILocation(line: 20, column: 3, scope: !21)
// CHECK:STDOUT: !23 = !DILocation(line: 21, column: 3, scope: !21)
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