trong created this revision.
trong added reviewers: srhines, nickdesaulniers.
Herald added a reviewer: javed.absar.
Herald added subscribers: jfb, kristof.beyls.
Making X[8-15,18] registers call-saved is used to support
CONFIG_ARM64_LSE_ATOMICS in Linux kernel.
Signed-off-by: Tri Vo <tr...@android.com>
Repository:
rC Clang
https://reviews.llvm.org/D52399
Files:
docs/ClangCommandLineReference.rst
include/clang/Driver/Options.td
lib/Driver/ToolChains/Arch/AArch64.cpp
test/Driver/aarch64-call-saved-x-register.c
Index: test/Driver/aarch64-call-saved-x-register.c
===================================================================
--- /dev/null
+++ test/Driver/aarch64-call-saved-x-register.c
@@ -0,0 +1,58 @@
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x8 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X8 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x9 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X9 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x10 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X10 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x11 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X11 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x12 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X12 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x13 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X13 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x14 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X14 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x15 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X15 %s
+
+// RUN: %clang -target aarch64-none-gnu -fcall-saved-x18 -### %s 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CALL-SAVED-X18 %s
+
+// Test all call-saved-x# options together.
+// RUN: %clang -target aarch64-none-gnu \
+// RUN: -fcall-saved-x8 \
+// RUN: -fcall-saved-x9 \
+// RUN: -fcall-saved-x10 \
+// RUN: -fcall-saved-x11 \
+// RUN: -fcall-saved-x12 \
+// RUN: -fcall-saved-x13 \
+// RUN: -fcall-saved-x14 \
+// RUN: -fcall-saved-x15 \
+// RUN: -fcall-saved-x18 \
+// RUN: -### %s 2>&1 | FileCheck %s \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X8 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X9 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X10 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X11 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X12 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X13 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X14 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X15 \
+// RUN: --check-prefix=CHECK-CALL-SAVED-X18
+
+// CHECK-CALL-SAVED-X8: "-target-feature" "+call-saved-x8"
+// CHECK-CALL-SAVED-X9: "-target-feature" "+call-saved-x9"
+// CHECK-CALL-SAVED-X10: "-target-feature" "+call-saved-x10"
+// CHECK-CALL-SAVED-X11: "-target-feature" "+call-saved-x11"
+// CHECK-CALL-SAVED-X12: "-target-feature" "+call-saved-x12"
+// CHECK-CALL-SAVED-X13: "-target-feature" "+call-saved-x13"
+// CHECK-CALL-SAVED-X14: "-target-feature" "+call-saved-x14"
+// CHECK-CALL-SAVED-X15: "-target-feature" "+call-saved-x15"
+// CHECK-CALL-SAVED-X18: "-target-feature" "+call-saved-x18"
Index: lib/Driver/ToolChains/Arch/AArch64.cpp
===================================================================
--- lib/Driver/ToolChains/Arch/AArch64.cpp
+++ lib/Driver/ToolChains/Arch/AArch64.cpp
@@ -225,6 +225,33 @@
if (Args.hasArg(options::OPT_ffixed_x20))
Features.push_back("+reserve-x20");
+ if (Args.hasArg(options::OPT_fcall_saved_x8))
+ Features.push_back("+call-saved-x8");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x9))
+ Features.push_back("+call-saved-x9");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x10))
+ Features.push_back("+call-saved-x10");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x11))
+ Features.push_back("+call-saved-x11");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x12))
+ Features.push_back("+call-saved-x12");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x13))
+ Features.push_back("+call-saved-x13");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x14))
+ Features.push_back("+call-saved-x14");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x15))
+ Features.push_back("+call-saved-x15");
+
+ if (Args.hasArg(options::OPT_fcall_saved_x18))
+ Features.push_back("+call-saved-x18");
+
if (Args.hasArg(options::OPT_mno_neg_immediates))
Features.push_back("+no-neg-immediates");
}
Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -2054,6 +2054,10 @@
def ffixed_x#i : Flag<["-"], "ffixed-x"#i>, Group<m_aarch64_Features_Group>,
HelpText<"Reserve the "#i#" register (AArch64 only)">;
+foreach i = {8-15,18} in
+ def fcall_saved_x#i : Flag<["-"], "fcall-saved-x"#i>, Group<m_aarch64_Features_Group>,
+ HelpText<"Make the x"#i#" register call-saved (AArch64 only)">;
+
def msign_return_address : Joined<["-"], "msign-return-address=">,
Flags<[CC1Option]>, Group<m_Group>,
HelpText<"Select return address signing scope">, Values<"none,all,non-leaf">;
Index: docs/ClangCommandLineReference.rst
===================================================================
--- docs/ClangCommandLineReference.rst
+++ docs/ClangCommandLineReference.rst
@@ -2334,6 +2334,42 @@
Reserve the x20 register (AArch64 only)
+.. option:: -fcall-saved-x8
+
+Make the x8 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x9
+
+Make the x9 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x10
+
+Make the x10 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x11
+
+Make the x11 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x12
+
+Make the x12 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x13
+
+Make the x13 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x14
+
+Make the x14 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x15
+
+Make the x15 register call-saved (AArch64 only)
+
+.. option:: -fcall-saved-x18
+
+Make the x18 register call-saved (AArch64 only)
+
.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769
Workaround Cortex-A53 erratum 835769 (AArch64 only)
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