diff --git a/gcc/config/riscv/riscv-cores.def b/gcc/config/riscv/riscv-cores.def
index 0785e8f3fbd..57928bccdc8 100644
--- a/gcc/config/riscv/riscv-cores.def
+++ b/gcc/config/riscv/riscv-cores.def
@@ -76,6 +76,15 @@ RISCV_CORE("sifive-s76",      "rv64imafdc", "sifive-7-series")
 RISCV_CORE("sifive-u54",      "rv64imafdc", "sifive-5-series")
 RISCV_CORE("sifive-u74",      "rv64imafdc", "sifive-7-series")
 RISCV_CORE("sifive-x280",     "rv64imafdcv_zfh_zba_zbb_zvfh_zvl512b", "sifive-7-series")
+RISCV_CORE("sifive-p450",     "rv64imafdc_za64rs_zic64b_zicbom_zicbop_zicboz_"
+			      "ziccamoa_ziccif_zicclsm_ziccrse_zicsr_zifencei_"
+			      "zihintntl_zihintpause_zihpm_zfhmin_zba_zbb_zbs",
+			      "sifive-p400-series")
+RISCV_CORE("sifive-p670",     "rv64imafdcv_za64rs_zic64b_zicbom_zicbop_zicboz_"
+			      "ziccamoa_ziccif_zicclsm_ziccrse_zicsr_zifencei_"
+			      "zihintntl_zihintpause_zihpm_zfhmin_zba_zbb_zbs_"
+			      "zvl128b_zvbb_zvknc_zvkng_zvksc_zvksg",
+			      "sifive-p600-series")
 
 RISCV_CORE("thead-c906",      "rv64imafdc_xtheadba_xtheadbb_xtheadbs_xtheadcmo_"
 			      "xtheadcondmov_xtheadfmemidx_xtheadmac_"
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index f8645822ca4..71339b8b30f 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -30707,7 +30707,8 @@ by particular CPU name.
 Permissible values for this option are: @samp{sifive-e20}, @samp{sifive-e21},
 @samp{sifive-e24}, @samp{sifive-e31}, @samp{sifive-e34}, @samp{sifive-e76},
 @samp{sifive-s21}, @samp{sifive-s51}, @samp{sifive-s54}, @samp{sifive-s76},
-@samp{sifive-u54}, @samp{sifive-u74}, and @samp{sifive-x280}.
+@samp{sifive-u54}, @samp{sifive-u74}, @samp{sifive-x280}, @samp{sifive-xp450},
+@samp{sifive-x670}.
 
 @opindex mtune
 @item -mtune=@var{processor-string}
diff --git a/gcc/testsuite/gcc.target/riscv/mcpu-sifive-p450.c b/gcc/testsuite/gcc.target/riscv/mcpu-sifive-p450.c
new file mode 100644
index 00000000000..563041821e7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/mcpu-sifive-p450.c
@@ -0,0 +1,34 @@
+/* { dg-do compile } */
+/* { dg-skip-if "-march given" { *-*-* } { "-march=*" } } */
+/* { dg-options "-mcpu=sifive-p450 -mabi=lp64d" } */
+/* SiFive p450 => rv64imafdc_za64rs_zic64b_zicbom_zicbop_zicboz_ziccamoa_ziccif_zicclsm_ziccrse_zicsr_zifencei_zihintntl_zihintpause_zihpm_zfhmin_zba_zbb_zbs */
+
+#if !((__riscv_xlen == 64)		\
+      && !defined(__riscv_32e)		\
+      && (__riscv_flen == 64)		\
+      && defined(__riscv_c)		\
+      && defined(__riscv_za64rs)	\
+      && defined(__riscv_zic64b)	\
+      && defined(__riscv_zicbom)	\
+      && defined(__riscv_zicbop)	\
+      && defined(__riscv_zicboz)	\
+      && defined(__riscv_ziccamoa)	\
+      && defined(__riscv_ziccif)	\
+      && defined(__riscv_zicclsm)	\
+      && defined(__riscv_ziccrse)	\
+      && defined(__riscv_zicsr)		\
+      && defined(__riscv_zifencei)	\
+      && defined(__riscv_zihintntl)	\
+      && defined(__riscv_zihintpause)	\
+      && defined(__riscv_zihpm)		\
+      && defined(__riscv_zfhmin)	\
+      && defined(__riscv_zba)		\
+      && defined(__riscv_zbb)		\
+      && defined(__riscv_zbs))
+#error "unexpected arch"
+#endif
+
+int main()
+{
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/mcpu-sifive-p670.c b/gcc/testsuite/gcc.target/riscv/mcpu-sifive-p670.c
new file mode 100644
index 00000000000..8dfd490f440
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/mcpu-sifive-p670.c
@@ -0,0 +1,40 @@
+/* { dg-do compile } */
+/* { dg-skip-if "-march given" { *-*-* } { "-march=*" } } */
+/* { dg-options "-mcpu=sifive-p670 -mabi=lp64d" } */
+/* SiFive p670 => rv64imafdcv_za64rs_zic64b_zicbom_zicbop_zicboz_ziccamoa_ziccif_zicclsm_ziccrse_zicsr_zifencei_zihintntl_zihintpause_zihpm_zfhmin_zba_zbb_zbs_zvl128b_zvbb_zvknc_zvkng_zvksc_zvksg */
+
+#if !((__riscv_xlen == 64)		\
+      && !defined(__riscv_32e)		\
+      && (__riscv_flen == 64)		\
+      && defined(__riscv_c)		\
+      && defined(__riscv_za64rs)	\
+      && defined(__riscv_zic64b)	\
+      && defined(__riscv_zicbom)	\
+      && defined(__riscv_zicbop)	\
+      && defined(__riscv_zicboz)	\
+      && defined(__riscv_ziccamoa)	\
+      && defined(__riscv_ziccif)	\
+      && defined(__riscv_zicclsm)	\
+      && defined(__riscv_ziccrse)	\
+      && defined(__riscv_zicsr)		\
+      && defined(__riscv_zifencei)	\
+      && defined(__riscv_zihintntl)	\
+      && defined(__riscv_zihintpause)	\
+      && defined(__riscv_zihpm)		\
+      && defined(__riscv_zfhmin)	\
+      && defined(__riscv_zba)		\
+      && defined(__riscv_zbb)		\
+      && defined(__riscv_zbs)		\
+      && defined(__riscv_zvl128b)	\
+      && defined(__riscv_zvbb)		\
+      && defined(__riscv_zvknc)		\
+      && defined(__riscv_zvkng)		\
+      && defined(__riscv_zvksc)		\
+      && defined(__riscv_zvksg))
+#error "unexpected arch"
+#endif
+
+int main()
+{
+  return 0;
+}