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Add support for running LLVM optimizer. (#6225)

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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>
This commit is contained in:
Richard Smith
2025-11-05 00:15:14 +00:00
committed by GitHub
co-authored by Dana Jansens Chandler Carruth
parent db150ffc5c
commit aa69a484eb
202 changed files with 3376 additions and 1253 deletions
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toolchain/lower/testdata/interop/cpp/function_in_template.carbon
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@@ -37,21 +37,23 @@ fn F() {
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN1XIiE1fEi = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CF.Main() !dbg !7 {
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CF.Main() #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN1XIiE1fEi(i32 42), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1XIiE1fEi(i32 %t) #0 comdat align 2 {
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1XIiE1fEi(i32 %t) #1 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %t.addr = alloca i32, align 4
// CHECK:STDOUT: store i32 %t, ptr %t.addr, align 4
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}