[gcc r10-8414] PowerPC: Add power10 hwcap2 bits
Peter Bergner
bergner@gcc.gnu.org
Thu Jul 2 17:29:31 GMT 2020
https://gcc.gnu.org/g:7549286a494ef8bc4c1107724735ca867c19cefb
commit r10-8414-g7549286a494ef8bc4c1107724735ca867c19cefb
Author: Michael Meissner <meissner@linux.ibm.com>
Date: Wed Jul 1 14:42:21 2020 -0500
PowerPC: Add power10 hwcap2 bits
This patch adds support for the two new HWCAP2 fields used by the
__builtin_cpu_supports function. It adds support in the target_clones
attribute for -mcpu=power10.
The two new __builtin_cpu_supports tests are:
__builtin_cpu_supports ("arch_3_1")
__builtin_cpu_supports ("mma")
The bits used are the bits that the Linux kernel engineers will be using for
these new features.
2020-06-05 Michael Meissner <meissner@linux.ibm.com>
gcc/
* config/rs6000/ppc-auxv.h (PPC_PLATFORM_POWER10): Allocate
'power10' PowerPC platform.
(PPC_FEATURE2_ARCH_3_1): New HWCAP2 bit for ARCH 3.1.
(PPC_FEATURE2_MMA): New HWCAP2 bit for MMA.
* config/rs6000/rs6000-call.c (cpu_supports_info): Add ARCH 3.1 and
MMA HWCAP2 bits.
gcc/testsuite/
* gcc.target/powerpc/clone3.c: New test for using 'power10' with
the target_clones attribute.
(cherry picked from commit 2753f2f8b4a4534ab364595ba4b8a913cc7254a7)
(cherry picked from commit 7ba33e898fa4a097c0f2b4d9cae35041a5933f9c)
Diff:
---
gcc/config/rs6000/ppc-auxv.h | 6 ++++++
gcc/config/rs6000/rs6000-call.c | 4 +++-
gcc/testsuite/gcc.target/powerpc/clone3.c | 33 +++++++++++++++++++++++++++++++
3 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/ppc-auxv.h b/gcc/config/rs6000/ppc-auxv.h
index 323293178e7..7a5ba0ebd47 100644
--- a/gcc/config/rs6000/ppc-auxv.h
+++ b/gcc/config/rs6000/ppc-auxv.h
@@ -48,6 +48,9 @@
#define PPC_PLATFORM_POWER8 13
#define PPC_PLATFORM_POWER9 14
+/* This is not yet official. */
+#define PPC_PLATFORM_POWER10 15
+
/* AT_HWCAP bits. These must match the values defined in the Linux kernel. */
#define PPC_FEATURE_32 0x80000000
#define PPC_FEATURE_64 0x40000000
@@ -93,6 +96,9 @@
#define PPC_FEATURE2_SCV 0x00100000
#define PPC_FEATURE2_HTM_NO_SUSPEND 0x00080000
+/* These are not yet official. */
+#define PPC_FEATURE2_ARCH_3_1 0x00040000
+#define PPC_FEATURE2_MMA 0x00020000
/* Thread Control Block (TCB) offsets of the AT_PLATFORM, AT_HWCAP and
AT_HWCAP2 values. These must match the values defined in GLIBC. */
diff --git a/gcc/config/rs6000/rs6000-call.c b/gcc/config/rs6000/rs6000-call.c
index e0ea0e748bd..8266335b67a 100644
--- a/gcc/config/rs6000/rs6000-call.c
+++ b/gcc/config/rs6000/rs6000-call.c
@@ -172,7 +172,9 @@ static const struct
{ "arch_3_00", PPC_FEATURE2_ARCH_3_00, 1 },
{ "ieee128", PPC_FEATURE2_HAS_IEEE128, 1 },
{ "darn", PPC_FEATURE2_DARN, 1 },
- { "scv", PPC_FEATURE2_SCV, 1 }
+ { "scv", PPC_FEATURE2_SCV, 1 },
+ { "arch_3_1", PPC_FEATURE2_ARCH_3_1, 1 },
+ { "mma", PPC_FEATURE2_MMA, 1 },
};
static void altivec_init_builtins (void);
diff --git a/gcc/testsuite/gcc.target/powerpc/clone3.c b/gcc/testsuite/gcc.target/powerpc/clone3.c
new file mode 100644
index 00000000000..ba6edbe0202
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/clone3.c
@@ -0,0 +1,33 @@
+/* { dg-do compile { target { powerpc*-*-linux* && lp64 } } } */
+/* { dg-options "-mdejagnu-cpu=power8 -O2" } */
+/* { dg-require-effective-target powerpc_pcrel } */
+/* { dg-require-effective-target ppc_cpu_supports_hw } */
+
+/* Power9 (aka, ISA 3.0) has a MODSD instruction to do modulus, while Power8
+ (aka, ISA 2.07) has to do modulus with divide and multiply. Make sure
+ both clone functions are generated.
+
+ POWER10 has pc-relative instructions to access static values, while earlier
+ systems used TOC addressing.
+
+ Restrict ourselves to Linux, since IFUNC might not be supported in other
+ operating systems. */
+
+static long s;
+long *p = &s;
+
+__attribute__((target_clones("cpu=power10,cpu=power9,default")))
+long mod_func (long a, long b)
+{
+ return (a % b) + s;
+}
+
+long mod_func_or (long a, long b, long c)
+{
+ return mod_func (a, b) | c;
+}
+
+/* { dg-final { scan-assembler-times {\mdivd\M} 1 } } */
+/* { dg-final { scan-assembler-times {\mmulld\M} 1 } } */
+/* { dg-final { scan-assembler-times {\mmodsd\M} 2 } } */
+/* { dg-final { scan-assembler-times {\mpld\M} 1 } } */
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