https://github.com/dhoekwater updated
https://github.com/llvm/llvm-project/pull/80916
>From 3eb66efd6d5a0f027191e2cdd65921f5058220d2 Mon Sep 17 00:00:00 2001
From: Daniel Hoekwater <hoekwa...@google.com>
Date: Wed, 7 Feb 2024 01:03:17 +0000
Subject: [PATCH] [Driver] Allow -fbasic-block-sections for AArch64 ELF
Basic block sections "all" doesn't work on AArch64 since branch
relaxation may create new basic blocks. However, the other basic
block section modes should work out of the box since machine function
splitting already uses the basic block sections pass.
---
clang/lib/Driver/ToolChains/Clang.cpp | 8 ++++++++
clang/test/Driver/fbasic-block-sections.c | 4 ++++
2 files changed, 12 insertions(+)
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp
b/clang/lib/Driver/ToolChains/Clang.cpp
index 13bf2421154372..942ebbc4106078 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5972,6 +5972,14 @@ void Clang::ConstructJob(Compilation &C, const JobAction
&JA,
<< A->getAsString(Args) << A->getValue();
else
A->render(Args, CmdArgs);
+ } else if (Triple.isAArch64() && Triple.isOSBinFormatELF()) {
+ // "all" is not supported on AArch64 since branch relaxation creates new
+ // basic blocks for some cross-section branches.
+ if (Val != "labels" && Val != "none" && !Val.starts_with("list="))
+ D.Diag(diag::err_drv_invalid_value)
+ << A->getAsString(Args) << A->getValue();
+ else
+ A->render(Args, CmdArgs);
} else if (Triple.isNVPTX()) {
// Do not pass the option to the GPU compilation. We still want it
enabled
// for the host-side compilation, so seeing it here is not an error.
diff --git a/clang/test/Driver/fbasic-block-sections.c
b/clang/test/Driver/fbasic-block-sections.c
index 24262209d1e4d5..5e701072bfc74a 100644
--- a/clang/test/Driver/fbasic-block-sections.c
+++ b/clang/test/Driver/fbasic-block-sections.c
@@ -2,6 +2,10 @@
// RUN: %clang -### --target=x86_64 -fbasic-block-sections=all %s -S 2>&1 |
FileCheck -check-prefix=CHECK-OPT-ALL %s
// RUN: %clang -### --target=x86_64 -fbasic-block-sections=list=%s %s -S 2>&1
| FileCheck -check-prefix=CHECK-OPT-LIST %s
// RUN: %clang -### --target=x86_64 -fbasic-block-sections=labels %s -S 2>&1 |
FileCheck -check-prefix=CHECK-OPT-LABELS %s
+// RUN: %clang -### --target=aarch64 -fbasic-block-sections=none %s -S 2>&1 |
FileCheck -check-prefix=CHECK-OPT-NONE %s
+// RUN: %clang -### --target=aarch64 -fbasic-block-sections=list=%s %s -S 2>&1
| FileCheck -check-prefix=CHECK-OPT-LIST %s
+// RUN: %clang -### --target=aarch64 -fbasic-block-sections=labels %s -S 2>&1
| FileCheck -check-prefix=CHECK-OPT-LABELS %s
+// RUN: not %clang -### --target=aarch64 -fbasic-block-sections=all %s -S 2>&1
| FileCheck -check-prefix=CHECK-OPT-ALL %s
// RUN: not %clang -c --target=arm-unknown-linux -fbasic-block-sections=all %s
-S 2>&1 | FileCheck -check-prefix=CHECK-TRIPLE %s
// RUN: %clang -### --target=arm-unknown-linux -fbasic-block-sections=all
-fbasic-block-sections=none %s -S 2>&1 \
// RUN: | FileCheck -check-prefix=CHECK-NOOPT %s
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