RISC-V: Support SiFive extensions: xsfvqmaccdod, xsfvqmaccqoq and xsfvfnrclipxfqf

Those SiFive extensions have been published on the web for a while, and we plan
to implement intrinsics in GCC for those instructions soon.

NOTE: The original patch was written by Nelson when he was still working at
SiFive, and Kito rebased it to the trunk. Therefore, I kept the author as Nelson
with his SiFive email.

Document links:
xsfvqmaccdod: https://www.sifive.com/document-file/sifive-int8-matrix-multiplication-extensions-specification
xsfvqmaccqoq: https://www.sifive.com/document-file/sifive-int8-matrix-multiplication-extensions-specification
xsfvfnrclipxfqf: https://www.sifive.com/document-file/fp32-to-int8-ranged-clip-instructions

Co-authored-by: Kito Cheng <kito.cheng@sifive.com>

11 files changed, 112 insertions, 2 deletions

diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index 701c724..45da83e 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1187,6 +1187,11 @@ static struct riscv_implicit_subset riscv_implicit_subsets[] =
   {"a", "+zaamo,+zalrsc", check_implicit_always},
 
   {"xsfvcp", "+zve32x", check_implicit_always},
+  {"xsfvqmaccqoq", "+zve32x,+zvl256b", check_implicit_always},
+  {"xsfvqmaccqoq", "+zvl256b", check_implicit_always},
+  {"xsfvqmaccdod", "+zve32x,+zvl128b", check_implicit_always},
+  {"xsfvfnrclipxfqf", "+zve32f", check_implicit_always},
+
   {"v", "+zve64d,+zvl128b", check_implicit_always},
   {"zvfh", "+zvfhmin,+zfhmin", check_implicit_always},
   {"zvfhmin", "+zve32f", check_implicit_always},
@@ -1493,6 +1498,9 @@ static struct riscv_supported_ext riscv_supported_vendor_x_ext[] =
   {"xventanacondops",	ISA_SPEC_CLASS_DRAFT,	1, 0, 0 },
   {"xsfvcp",		ISA_SPEC_CLASS_DRAFT,	1, 0, 0 },
   {"xsfcease",		ISA_SPEC_CLASS_DRAFT,	1, 0, 0 },
+  {"xsfvqmaccqoq",	ISA_SPEC_CLASS_DRAFT,	1, 0, 0},
+  {"xsfvqmaccdod",	ISA_SPEC_CLASS_DRAFT,	1, 0, 0},
+  {"xsfvfnrclipxfqf",	ISA_SPEC_CLASS_DRAFT,	1, 0, 0},
   {NULL, 0, 0, 0, 0}
 };
 
@@ -2776,6 +2784,12 @@ riscv_multi_subset_supports (riscv_parse_subset_t *rps,
       return riscv_subset_supports (rps, "xsfvcp");
     case INSN_CLASS_XSFCEASE:
       return riscv_subset_supports (rps, "xsfcease");
+    case INSN_CLASS_XSFVQMACCQOQ:
+      return riscv_subset_supports (rps, "xsfvqmaccqoq");
+    case INSN_CLASS_XSFVQMACCDOD:
+      return riscv_subset_supports (rps, "xsfvqmaccdod");
+    case INSN_CLASS_XSFVFNRCLIPXFQF:
+      return riscv_subset_supports (rps, "xsfvfnrclipxfqf");
     default:
       rps->error_handler
         (_("internal: unreachable INSN_CLASS_*"));
diff --git a/gas/NEWS b/gas/NEWS
index 67ca298..d4143da 100644
--- a/gas/NEWS
+++ b/gas/NEWS
@@ -6,8 +6,9 @@
 
 * On x86 emulation support (for secondary targets) was dropped.
 
-* Add support for RISC-V Zcmp (cm.mva01s, cm.mvsa01), Smrnmi and CORE-V
-  (xcvbitmanip, xcvsimd) extensions with version 1.0.
+* Add support for RISC-V Zcmp (cm.mva01s, cm.mvsa01), Smrnmi, CORE-V
+  (xcvbitmanip, xcvsimd) extensions with version 1.0 and more SiFive
+  extensions (xsfvqmaccdod, xsfvqmaccqoq and xsfvfnrclipxfqf).
 
 Changes in 2.43:
 
diff --git a/gas/testsuite/gas/riscv/march-help.l b/gas/testsuite/gas/riscv/march-help.l
index 4234b05..71cccb7 100644
--- a/gas/testsuite/gas/riscv/march-help.l
+++ b/gas/testsuite/gas/riscv/march-help.l
@@ -157,3 +157,6 @@ All available -march extensions for RISC-V:
 	xventanacondops                         1.0
 	xsfvcp                                  1.0
 	xsfcease                                1.0
+	xsfvqmaccqoq                            1.0
+	xsfvqmaccdod                            1.0
+	xsfvfnrclipxfqf                         1.0
diff --git a/gas/testsuite/gas/riscv/march-imply-xsfvfnrclipxfqf.d b/gas/testsuite/gas/riscv/march-imply-xsfvfnrclipxfqf.d
new file mode 100644
index 0000000..e77fee0
--- /dev/null
+++ b/gas/testsuite/gas/riscv/march-imply-xsfvfnrclipxfqf.d
@@ -0,0 +1,6 @@
+#as: -march=rv32i_xsfvfnrclipxfqf -march-attr -misa-spec=20191213
+#readelf: -A
+#source: empty.s
+Attribute Section: riscv
+File Attributes
+  Tag_RISCV_arch: "rv32i2p1_f2p2_zicsr2p0_zve32f1p0_zve32x1p0_zvl32b1p0_xsfvfnrclipxfqf1p0"
diff --git a/gas/testsuite/gas/riscv/march-imply-xsfvqmaccdod.d b/gas/testsuite/gas/riscv/march-imply-xsfvqmaccdod.d
new file mode 100644
index 0000000..47e91f8
--- /dev/null
+++ b/gas/testsuite/gas/riscv/march-imply-xsfvqmaccdod.d
@@ -0,0 +1,6 @@
+#as: -march=rv32i_xsfvqmaccdod -march-attr -misa-spec=20191213
+#readelf: -A
+#source: empty.s
+Attribute Section: riscv
+File Attributes
+  Tag_RISCV_arch: "rv32i2p1_zicsr2p0_zve32x1p0_zvl128b1p0_zvl32b1p0_zvl64b1p0_xsfvqmaccdod1p0"
diff --git a/gas/testsuite/gas/riscv/march-imply-xsfvqmaccqoq.d b/gas/testsuite/gas/riscv/march-imply-xsfvqmaccqoq.d
new file mode 100644
index 0000000..784a8ac
--- /dev/null
+++ b/gas/testsuite/gas/riscv/march-imply-xsfvqmaccqoq.d
@@ -0,0 +1,6 @@
+#as: -march=rv32i_xsfvqmaccqoq -march-attr -misa-spec=20191213
+#readelf: -A
+#source: empty.s
+Attribute Section: riscv
+File Attributes
+  Tag_RISCV_arch: "rv32i2p1_zicsr2p0_zve32x1p0_zvl128b1p0_zvl256b1p0_zvl32b1p0_zvl64b1p0_xsfvqmaccqoq1p0"
diff --git a/gas/testsuite/gas/riscv/sifive-insns.d b/gas/testsuite/gas/riscv/sifive-insns.d
index 610f625..d1917b4 100644
--- a/gas/testsuite/gas/riscv/sifive-insns.d
+++ b/gas/testsuite/gas/riscv/sifive-insns.d
@@ -36,3 +36,13 @@ Disassembly of section .text:
 [ 	]+[0-9a-f]+:[ 	]+fc27b05b[ 	]+sf.vc.v.ivw[ 	]+0x3,v0,v2,15
 [ 	]+[0-9a-f]+:[ 	]+fc25d05b[ 	]+sf.vc.v.fvw[ 	]+0x1,v0,v2,fa1
 [ 	]+[0-9a-f]+:[ 	]+30500073[ 	]+sf.cease
+[ 	]+[0-9a-f]+:[ 	]+f2c4225b[ 	]+sf.vqmaccu.4x8x4[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+f6c4225b[ 	]+sf.vqmacc.4x8x4[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+fac4225b[ 	]+sf.vqmaccus.4x8x4[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+fec4225b[ 	]+sf.vqmaccsu.4x8x4[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+b2c4225b[ 	]+sf.vqmaccu.2x8x2[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+b6c4225b[ 	]+sf.vqmacc.2x8x2[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+bac4225b[ 	]+sf.vqmaccus.2x8x2[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+bec4225b[ 	]+sf.vqmaccsu.2x8x2[ 	]+v4,v8,v12
+[ 	]+[0-9a-f]+:[ 	]+8a86525b[ 	]+sf.vfnrclip.xu.f.qf[ 	]+v4,v8,fa2
+[ 	]+[0-9a-f]+:[ 	]+8e86525b[ 	]+sf.vfnrclip.x.f.qf[ 	]+v4,v8,fa2
diff --git a/gas/testsuite/gas/riscv/sifive-insns.s b/gas/testsuite/gas/riscv/sifive-insns.s
index cdf90c1..5005fb3 100644
--- a/gas/testsuite/gas/riscv/sifive-insns.s
+++ b/gas/testsuite/gas/riscv/sifive-insns.s
@@ -37,3 +37,28 @@
 	.option arch, +xsfcease1p0
 	sf.cease
 	.option pop
+
+	# xsfvqmaccqoq
+	.option push
+	.option arch, +xsfvqmaccqoq
+	sf.vqmaccu.4x8x4 v4, v8, v12
+	sf.vqmacc.4x8x4 v4, v8, v12
+	sf.vqmaccus.4x8x4 v4, v8, v12
+	sf.vqmaccsu.4x8x4 v4, v8, v12
+	.option pop
+
+	# xsfvqmaccdod
+	.option push
+	.option arch, +xsfvqmaccdod
+	sf.vqmaccu.2x8x2 v4, v8, v12
+	sf.vqmacc.2x8x2 v4, v8, v12
+	sf.vqmaccus.2x8x2 v4, v8, v12
+	sf.vqmaccsu.2x8x2 v4, v8, v12
+	.option pop
+
+	# xsfvfnrclipxfqf
+	.option push
+	.option arch, +xsfvfnrclipxfqf
+	sf.vfnrclip.xu.f.qf v4, v8, f12
+	sf.vfnrclip.x.f.qf  v4, v8, f12
+	.option pop
diff --git a/include/opcode/riscv-opc.h b/include/opcode/riscv-opc.h
index 8165686..253148b 100644
--- a/include/opcode/riscv-opc.h
+++ b/include/opcode/riscv-opc.h
@@ -3745,6 +3745,28 @@
 /* Vendor-specific (SiFive) cease instruction.  */
 #define MATCH_SF_CEASE 0x30500073
 #define MASK_SF_CEASE 0xffffffff
+/* SiFive custom int8 matrix-multiply instruction.  */
+#define MATCH_SFVQMACCU4X8X4 0xf200205b
+#define MASK_SFVQMACCU4X8X4 0xfe00707f
+#define MATCH_SFVQMACC4X8X4 0xf600205b
+#define MASK_SFVQMACC4X8X4 0xfe00707f
+#define MATCH_SFVQMACCUS4X8X4 0xfa00205b
+#define MASK_SFVQMACCUS4X8X4 0xfe00707f
+#define MATCH_SFVQMACCSU4X8X4 0xfe00205b
+#define MASK_SFVQMACCSU4X8X4 0xfe00707f
+#define MATCH_SFVQMACCU2X8X2 0xb200205b
+#define MASK_SFVQMACCU2X8X2 0xfe00707f
+#define MATCH_SFVQMACC2X8X2 0xb600205b
+#define MASK_SFVQMACC2X8X2 0xfe00707f
+#define MATCH_SFVQMACCUS2X8X2 0xba00205b
+#define MASK_SFVQMACCUS2X8X2 0xfe00707f
+#define MATCH_SFVQMACCSU2X8X2 0xbe00205b
+#define MASK_SFVQMACCSU2X8X2 0xfe00707f
+/* FP32-to-int8 Ranged Clip Instructions (Xsfvfnrclipxfqf).  */
+#define MATCH_SFVFNRCLIPXUFQF 0x8a00505b
+#define MASK_SFVFNRCLIPXUFQF 0xfe00707f
+#define MATCH_SFVFNRCLIPXFQF 0x8e00505b
+#define MASK_SFVFNRCLIPXFQF 0xfe00707f
 /* Unprivileged Counter/Timers CSR addresses.  */
 #define CSR_CYCLE 0xc00
 #define CSR_TIME 0xc01
diff --git a/include/opcode/riscv.h b/include/opcode/riscv.h
index 5e5131e..fedfdd2 100644
--- a/include/opcode/riscv.h
+++ b/include/opcode/riscv.h
@@ -554,6 +554,9 @@ enum riscv_insn_class
   INSN_CLASS_XVENTANACONDOPS,
   INSN_CLASS_XSFVCP,
   INSN_CLASS_XSFCEASE,
+  INSN_CLASS_XSFVQMACCQOQ,
+  INSN_CLASS_XSFVQMACCDOD,
+  INSN_CLASS_XSFVFNRCLIPXFQF,
 };
 
 /* This structure holds information for a particular instruction.  */
diff --git a/opcodes/riscv-opc.c b/opcodes/riscv-opc.c
index 787beb7..200fe26 100644
--- a/opcodes/riscv-opc.c
+++ b/opcodes/riscv-opc.c
@@ -3449,6 +3449,20 @@ const struct riscv_opcode riscv_opcodes[] =
 /* Vendor-specific (SiFive) cease instruction.  */
 {"sf.cease", 0, INSN_CLASS_XSFCEASE, "", MATCH_SF_CEASE, MASK_SF_CEASE, match_opcode, 0 },
 
+/* SiFive custom int8 matrix-multiply instructions.  */
+{"sf.vqmaccu.4x8x4",  0, INSN_CLASS_XSFVQMACCQOQ, "Vd,Vs,Vt", MATCH_SFVQMACCU4X8X4, MASK_SFVQMACCU4X8X4, match_opcode, 0},
+{"sf.vqmacc.4x8x4",   0, INSN_CLASS_XSFVQMACCQOQ, "Vd,Vs,Vt", MATCH_SFVQMACC4X8X4, MASK_SFVQMACC4X8X4, match_opcode, 0},
+{"sf.vqmaccus.4x8x4", 0, INSN_CLASS_XSFVQMACCQOQ, "Vd,Vs,Vt", MATCH_SFVQMACCUS4X8X4, MASK_SFVQMACCUS4X8X4, match_opcode, 0},
+{"sf.vqmaccsu.4x8x4", 0, INSN_CLASS_XSFVQMACCQOQ, "Vd,Vs,Vt", MATCH_SFVQMACCSU4X8X4, MASK_SFVQMACCSU4X8X4, match_opcode, 0},
+{"sf.vqmaccu.2x8x2",  0, INSN_CLASS_XSFVQMACCDOD, "Vd,Vs,Vt", MATCH_SFVQMACCU2X8X2, MASK_SFVQMACCU2X8X2, match_opcode, 0},
+{"sf.vqmacc.2x8x2",   0, INSN_CLASS_XSFVQMACCDOD, "Vd,Vs,Vt", MATCH_SFVQMACC2X8X2, MASK_SFVQMACC2X8X2, match_opcode, 0},
+{"sf.vqmaccus.2x8x2", 0, INSN_CLASS_XSFVQMACCDOD, "Vd,Vs,Vt", MATCH_SFVQMACCUS2X8X2, MASK_SFVQMACCUS2X8X2, match_opcode, 0},
+{"sf.vqmaccsu.2x8x2", 0, INSN_CLASS_XSFVQMACCDOD, "Vd,Vs,Vt", MATCH_SFVQMACCSU2X8X2, MASK_SFVQMACCSU2X8X2, match_opcode, 0},
+
+/* SiFive FP32-to-int8 ranged clip instructions (Xsfvfnrclipxfqf).  */
+{"sf.vfnrclip.xu.f.qf", 0, INSN_CLASS_XSFVFNRCLIPXFQF, "Vd,Vt,S", MATCH_SFVFNRCLIPXUFQF, MASK_SFVFNRCLIPXUFQF, match_opcode, 0},
+{"sf.vfnrclip.x.f.qf",  0, INSN_CLASS_XSFVFNRCLIPXFQF, "Vd,Vt,S", MATCH_SFVFNRCLIPXFQF, MASK_SFVFNRCLIPXFQF, match_opcode, 0},
+
 /* Terminate the list.  */
 {0, 0, INSN_CLASS_NONE, 0, 0, 0, 0, 0}
 };