[PATCH, GCC, AARCH64] Add support for +profile extension

This patch adds support for the Statistical Profiling Extension (SPE) on
AArch64. Even though the compiler will not generate code any differently
given this extension, it will need to pass it on to the assembler in
order to let it correctly assemble inline asm containing accesses to the
extension's system registers.  The same applies when using the
preprocessor on an assembly file as this first must pass through cc1.

I left the hwcaps string for SPE empty as the kernel does not define a
feature string for this extension.  The current effect of this is that
driver will disable profile feature bit in GCC.  This is OK though
because we don't, nor do we ever, enable this feature bit, as codegen is
not affect by the SPE support and more importantly the driver will still
pass the extension down to the assembler regardless.

gcc/ChangeLog
2018-07-19  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* config/aarch64/aarch64-option-extensions.def: New entry for profile
	extension.
	* config/aarch64/aarch64.h (AARCH64_FL_PROFILE): New.
	* doc/invoke.texi (aarch64-feature-modifiers): New entry for profile
	extension.

gcc/testsuite/ChangeLog
2018-07-19  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* gcc.target/aarch64/profile.c: New test.

From-SVN: r262882

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2f8d59cf6df81e7eb558f4274c3b0eac5430917d..0c998afe459cdcb448a86bd553220a4be302b7af 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2018-07-19  Andre Vieira  <andre.simoesdiasvieira@arm.com>
+
+       * config/aarch64/aarch64-option-extensions.def: New entry for profile
+       extension.
+       * config/aarch64/aarch64.h (AARCH64_FL_PROFILE): New.
+       * doc/invoke.texi (aarch64-feature-modifiers): New entry for profile
+       extension.
+
 2018-07-19  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
        PR target/83009

diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 5fe5e3f7dddf622a48a5b9458ef30449a886f395..69ab796a4e1a959b89ebb55b599919c442cfb088 100644 (file)
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -105,4 +105,7 @@ AARCH64_OPT_EXTENSION("fp16fml", AARCH64_FL_F16FML, AARCH64_FL_FP | AARCH64_FL_F
    Disabling "sve" just disables "sve".  */
 AARCH64_OPT_EXTENSION("sve", AARCH64_FL_SVE, AARCH64_FL_FP | AARCH64_FL_SIMD | AARCH64_FL_F16, 0, "sve")
 
+/* Enabling/Disabling "profile" does not enable/disable any other feature.  */
+AARCH64_OPT_EXTENSION("profile", AARCH64_FL_PROFILE, 0, 0, "")
+
 #undef AARCH64_OPT_EXTENSION

diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index f284e74bfb8c9bab2aa22cc6c5a67750cbbba3c2..c1218503bab19323eee1cca8b7e4bea8fbfcf573 100644 (file)
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -158,6 +158,9 @@ extern unsigned aarch64_architecture_version;
 #define AARCH64_FL_SHA3              (1 << 18)  /* Has ARMv8.4-a SHA3 and SHA512.  */
 #define AARCH64_FL_F16FML     (1 << 19)  /* Has ARMv8.4-a FP16 extensions.  */
 
+/* Statistical Profiling extensions.  */
+#define AARCH64_FL_PROFILE    (1 << 20)
+
 /* Has FP and SIMD.  */
 #define AARCH64_FL_FPSIMD     (AARCH64_FL_FP | AARCH64_FL_SIMD)
 

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 9804808f128bc2bd808c63e43c2577cb2c413361..485f5998225b4486d49523173fe3f2b3e934dc2d 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -14845,6 +14845,9 @@ instructions. Use of this option with architectures prior to Armv8.2-A is not su
 @item sm4
 Enable the sm3 and sm4 crypto extension.  This also enables Advanced SIMD instructions.
 Use of this option with architectures prior to Armv8.2-A is not supported.
+@item profile
+Enable the Statistical Profiling extension.  This option is only to enable the
+extension at the assembler level and does not affect code generation.
 
 @end table
 

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 50a8cdf79723e1f1f47eaf7e402abcb3aafde333..2555ac0f8aa15ad616e69c3760435110128b01e9 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2018-07-19  Andre Vieira  <andre.simoesdiasvieira@arm.com>
+
+       * gcc.target/aarch64/profile.c: New test.
+
 2018-07-19  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
        PR target/83009

diff --git a/gcc/testsuite/gcc.target/aarch64/profile.c b/gcc/testsuite/gcc.target/aarch64/profile.c
new file mode 100644 (file)
index 0000000..c2dd112
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/profile.c
@@ -0,0 +1,3 @@
+/* { dg-do compile } */
+/* { dg-options "-march=armv8.2-a+profile" } */
+/* { dg-final { scan-assembler "\\.arch armv8.2-a\[\^\n\]*\\+profile\[\^\n\]*\n" } } */