[gcc(refs/users/wschmidt/heads/pu-upstream)] [AArch64] Make -moutline-atomics on by default

[gcc(refs/users/wschmidt/heads/pu-upstream)] [AArch64] Make -moutline-atomics on by default

[William Schmidt]

https://gcc.gnu.org/g:cd4b68527988f42c10c0d6c10e812d299887e0c2

commit cd4b68527988f42c10c0d6c10e812d299887e0c2
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date:   Thu Apr 30 13:12:13 2020 +0100

    [AArch64] Make -moutline-atomics on by default
    
    2020-04-30  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
    
            * config/aarch64/aarch64.h (TARGET_OUTLINE_ATOMICS): Define.
            * config/aarch64/aarch64.opt (moutline-atomics): Change to Int variable.
            * doc/invoke.texi (moutline-atomics): Document as on by default.

Diff:
---
 gcc/ChangeLog                  | 6 ++++++
 gcc/config/aarch64/aarch64.h   | 5 +++++
 gcc/config/aarch64/aarch64.opt | 2 +-
 gcc/doc/invoke.texi            | 1 +
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c81801f289e..c6e2447cd5c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2020-04-30  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* config/aarch64/aarch64.h (TARGET_OUTLINE_ATOMICS): Define.
+	* config/aarch64/aarch64.opt (moutline-atomics): Change to Int variable.
+	* doc/invoke.texi (moutline-atomics): Document as on by default.
+
 2020-04-30  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
 	PR target/94748
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 74236c3cffd..24767c747ba 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -105,6 +105,11 @@
    port.  */
 #define TARGET_PTRMEMFUNC_VBIT_LOCATION ptrmemfunc_vbit_in_delta
 
+
+/* Emit calls to libgcc helpers for atomic operations for runtime detection
+   of LSE instructions.  */
+#define TARGET_OUTLINE_ATOMICS (aarch64_flag_outline_atomics)
+
 /* Align definitions of arrays, unions and structures so that
    initializations and copies can be made more efficient.  This is not
    ABI-changing, so it only affects places where we can see the
diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt
index 37181b5baca..d99d14c137d 100644
--- a/gcc/config/aarch64/aarch64.opt
+++ b/gcc/config/aarch64/aarch64.opt
@@ -256,7 +256,7 @@ TargetVariable
 long aarch64_stack_protector_guard_offset = 0
 
 moutline-atomics
-Target Report Mask(OUTLINE_ATOMICS) Save
+Target Report Var(aarch64_flag_outline_atomics) Init(2) Save
 Generate local calls to out-of-line atomic operations.
 
 -param=aarch64-sve-compare-costs=
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 5bb7d94833e..527d362533a 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -16886,6 +16886,7 @@ instruction set.  If using a later revision, e.g. @option{-march=armv8.1-a}
 or @option{-march=armv8-a+lse}, the ARMv8.1-Atomics instructions will be
 used directly.  The same applies when using @option{-mcpu=} when the
 selected cpu supports the @samp{lse} feature.
+This option is on by default.
 
 @item -march=@var{name}
 @opindex march