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[Patch AArch64] Add rcpc extension
- From: James Greenhalgh <james dot greenhalgh at arm dot com>
- To: <gcc-patches at gcc dot gnu dot org>
- Cc: <nd at arm dot com>, <richard dot earnshaw at arm dot com>, <marcus dot shawcroft at arm dot com>
- Date: Tue, 20 Jun 2017 14:50:51 +0100
- Subject: [Patch AArch64] Add rcpc extension
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Hi,
While GCC doesn't need to know anything about the RcPc extension for code
generation, we do need to add the extension flag to the string we pass
to the assembler when we're compiling for a CPU which implements the RcPc
extension.
I've built a toolchain with this patch applied, and checked that we
correctly pass +rcpc on to the assembler if we give something like
-mcpu=generic+rcpc .
OK?
Thanks,
James
---
2017-06-20 James Greenhalgh <james.greenhalgh@arm.com>
* config/aarch64/aarch64-option-extensions.def (rcpc): New.
* config/aarch64/aarch64.h (AARCH64_FL_RCPC): New.
diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index b54de03..c0752ce 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -60,4 +60,7 @@ AARCH64_OPT_EXTENSION("lse", AARCH64_FL_LSE, 0, 0, "atomics")
Disabling "fp16" just disables "fp16". */
AARCH64_OPT_EXTENSION("fp16", AARCH64_FL_F16, AARCH64_FL_FP, 0, "fphp asimdhp")
+/* Enabling or disabling "rcpc" only changes "rcpc". */
+AARCH64_OPT_EXTENSION("rcpc", AARCH64_FL_RCPC, 0, 0, "lrcpc")
+
#undef AARCH64_OPT_EXTENSION
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index e4fb96f..3b3f27e 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -140,6 +140,7 @@ extern unsigned aarch64_architecture_version;
#define AARCH64_FL_F16 (1 << 9) /* Has ARMv8.2-A FP16 extensions. */
/* ARMv8.3-A architecture extensions. */
#define AARCH64_FL_V8_3 (1 << 10) /* Has ARMv8.3-A features. */
+#define AARCH64_FL_RCPC (1 << 11) /* Has support for RCpc model. */
/* Has FP and SIMD. */
#define AARCH64_FL_FPSIMD (AARCH64_FL_FP | AARCH64_FL_SIMD)