RISC-V: Add support for B standard extension

This patch adds support for recognizing the B standard extension to be the
collection of Zba, Zbb, Zbs extensions for consistency and conciseness
across toolchains

https://github.com/riscv/riscv-b/tags

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc: Add imply rules for B extension
	* config/riscv/arch-canonicalize: Ditto

Signed-off-by: Edwin Lu <ewlu@rivosinc.com>

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index dab2e76796538655a028ded75d3f732c3d9393ff..b0a16f5bd30f63276ff6ad3b92a5d9e3e364e5ef 100644 (file)
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -84,6 +84,10 @@ static const riscv_implied_info_t riscv_implied_info[] =
 
   {"zabha", "zaamo"},
 
+  {"b", "zba"},
+  {"b", "zbb"},
+  {"b", "zbs"},
+
   {"zdinx", "zfinx"},
   {"zfinx", "zicsr"},
   {"zdinx", "zicsr"},
@@ -245,6 +249,8 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
   {"c", ISA_SPEC_CLASS_20190608, 2, 0},
   {"c", ISA_SPEC_CLASS_2P2,      2, 0},
 
+  {"b",       ISA_SPEC_CLASS_NONE, 1, 0},
+
   {"h",       ISA_SPEC_CLASS_NONE, 1, 0},
 
   {"v",       ISA_SPEC_CLASS_NONE, 1, 0},
@@ -405,6 +411,7 @@ static const struct riscv_ext_version riscv_ext_version_table[] =
 static const struct riscv_ext_version riscv_combine_info[] =
 {
   {"a", ISA_SPEC_CLASS_20191213, 2, 1},
+  {"b",  ISA_SPEC_CLASS_NONE, 1, 0},
   {"zk",  ISA_SPEC_CLASS_NONE, 1, 0},
   {"zkn",  ISA_SPEC_CLASS_NONE, 1, 0},
   {"zks",  ISA_SPEC_CLASS_NONE, 1, 0},

diff --git a/gcc/config/riscv/arch-canonicalize b/gcc/config/riscv/arch-canonicalize
index 35a7fe4455a6b52424569ec9356067fc36b12557..2ea514dd9869f3389dfa2ccd55a4f2708620a32a 100755 (executable)
--- a/gcc/config/riscv/arch-canonicalize
+++ b/gcc/config/riscv/arch-canonicalize
@@ -45,6 +45,7 @@ IMPLIED_EXT = {
   "zabha" : ["zaamo"],
 
   "f" : ["zicsr"],
+  "b" : ["zba", "zbb", "zbs"],
   "zdinx" : ["zfinx", "zicsr"],
   "zfinx" : ["zicsr"],
   "zhinx" : ["zhinxmin", "zfinx", "zicsr"],