aarch64: Add +flagm to -march

New +flagm (Condition flag manipulation) feature option for -march command line
option.

Please note that FLAGM stays a Armv8.4-A feature but now can be
assigned to other architectures or CPUs.

gcc/ChangeLog:

	* config/aarch64/aarch64-option-extensions.def
	(AARCH64_OPT_EXTENSION): New +flagm option in -march for AArch64.
	* config/aarch64/aarch64.h (AARCH64_FL_FLAGM): Add new flagm extension bit
	mask.
	(AARCH64_FL_FOR_ARCH8_4): Add flagm to Armv8.4-A.
	* doc/invoke.texi: Update docs with +flagm.

diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index ca08642..ec45301 100644 (file)
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -226,4 +226,7 @@ AARCH64_OPT_EXTENSION("f64mm", AARCH64_FL_F64MM, \
 AARCH64_OPT_EXTENSION("bf16", AARCH64_FL_BF16, \
                      AARCH64_FL_SIMD | AARCH64_FL_FP, 0, false, "bf16")
 
+/* Enabling/Disabling "flagm" only changes "flagm".  */
+AARCH64_OPT_EXTENSION("flagm", AARCH64_FL_FLAGM, 0, 0, false, "flagm")
+
 #undef AARCH64_OPT_EXTENSION

diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index d241c5b..0bdcc74 100644 (file)
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -224,6 +224,9 @@ extern unsigned aarch64_architecture_version;
 /* 64-bit Floating-point Matrix Multiply (F64MM) extensions.  */
 #define AARCH64_FL_F64MM      (1ULL << 38)
 
+/* Flag Manipulation Instructions (FLAGM) extension.  */
+#define AARCH64_FL_FLAGM      (1ULL << 39)
+
 /* Has FP and SIMD.  */
 #define AARCH64_FL_FPSIMD     (AARCH64_FL_FP | AARCH64_FL_SIMD)
 
@@ -241,7 +244,7 @@ extern unsigned aarch64_architecture_version;
   (AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_V8_3)
 #define AARCH64_FL_FOR_ARCH8_4                 \
   (AARCH64_FL_FOR_ARCH8_3 | AARCH64_FL_V8_4 | AARCH64_FL_F16FML \
-   | AARCH64_FL_DOTPROD | AARCH64_FL_RCPC8_4)
+   | AARCH64_FL_DOTPROD | AARCH64_FL_RCPC8_4 | AARCH64_FL_FLAGM)
 #define AARCH64_FL_FOR_ARCH8_5                 \
   (AARCH64_FL_FOR_ARCH8_4 | AARCH64_FL_V8_5    \
    | AARCH64_FL_SB | AARCH64_FL_SSBS | AARCH64_FL_PREDRES)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 0844408..35cd3dc 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -18164,6 +18164,9 @@ Enable brain half-precision floating-point instructions.  This also enables
 Advanced SIMD and floating-point instructions.  This option is enabled by
 default for @option{-march=armv8.6-a}.  Use of this option with architectures
 prior to Armv8.2-A is not supported.
+@item flagm
+Enable the Flag Manipulation instructions Extension. This option is enabled by
+default for @option{-march=armv8.4-a}.
 
 @end table