gcc/ChangeLog:
* config/riscv/constraints.md (cr): New.
(cf): New.
* config/riscv/riscv.h (reg_class): Add RVC_GR_REGS and
RVC_FP_REGS.
(REG_CLASS_NAMES): Ditto.
(REG_CLASS_CONTENTS): Ditto.
* doc/md.texi: Document cr and cf constraint.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/constraint-cf-zfinx.c: New.
* gcc.target/riscv/constraint-cf.c: New.
* gcc.target/riscv/constraint-cr.c: New.
---
gcc/config/riscv/constraints.md | 6 ++++++
gcc/config/riscv/riscv.h | 6 ++++++
gcc/doc/md.texi | 7 +++++++
.../gcc.target/riscv/constraint-cf-zfinx.c | 14 ++++++++++++++
gcc/testsuite/gcc.target/riscv/constraint-cf.c | 14 ++++++++++++++
gcc/testsuite/gcc.target/riscv/constraint-cr.c | 13 +++++++++++++
6 files changed, 60 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/riscv/constraint-cf-zfinx.c
create mode 100644 gcc/testsuite/gcc.target/riscv/constraint-cf.c
create mode 100644 gcc/testsuite/gcc.target/riscv/constraint-cr.c
diff --git a/gcc/config/riscv/constraints.md b/gcc/config/riscv/constraints.md
index af8186117db..2dce9832219 100644
--- a/gcc/config/riscv/constraints.md
+++ b/gcc/config/riscv/constraints.md
@@ -33,6 +33,12 @@ (define_register_constraint "j" "SIBCALL_REGS"
(define_register_constraint "l" "JALR_REGS"
"@internal")
+(define_register_constraint "cr" "RVC_GR_REGS"
+ "RVC general purpose register (x8-x15).")
+
+(define_register_constraint "cf" "TARGET_HARD_FLOAT ? RVC_FP_REGS :
(TARGET_ZFINX ? RVC_GR_REGS : NO_REGS)"
+ "RVC floating-point registers (f8-f15), if available, reuse GPR as FPR when
use zfinx.")
+
;; General constraints
(define_constraint "I"
diff --git a/gcc/config/riscv/riscv.h b/gcc/config/riscv/riscv.h
index 09de74667a9..bbb3b56ca7d 100644
--- a/gcc/config/riscv/riscv.h
+++ b/gcc/config/riscv/riscv.h
@@ -505,7 +505,9 @@ enum reg_class
NO_REGS, /* no registers in set */
SIBCALL_REGS, /* registers used by indirect sibcalls
*/
JALR_REGS, /* registers used by indirect calls */
+ RVC_GR_REGS, /* RVC general registers */
GR_REGS, /* integer registers */
+ RVC_FP_REGS, /* RVC floating-point registers */
FP_REGS, /* floating-point registers */
FRAME_REGS, /* arg pointer and frame pointer */
VM_REGS, /* v0.t registers */
@@ -528,7 +530,9 @@ enum reg_class
"NO_REGS", \
"SIBCALL_REGS", \
"JALR_REGS", \
+ "RVC_GR_REGS", \
"GR_REGS", \
+ "RVC_FP_REGS", \
"FP_REGS", \
"FRAME_REGS",
\
"VM_REGS", \
@@ -553,7 +557,9 @@ enum reg_class
{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 }, /* NO_REGS */
\
{ 0xf003fcc0, 0x00000000, 0x00000000, 0x00000000 }, /* SIBCALL_REGS */
\
{ 0xffffffc0, 0x00000000, 0x00000000, 0x00000000 }, /* JALR_REGS */
\
+ { 0x0000ff00, 0x00000000, 0x00000000, 0x00000000 }, /* RVC_GR_REGS */
\
{ 0xffffffff, 0x00000000, 0x00000000, 0x00000000 }, /* GR_REGS */
\
+ { 0x00000000, 0x0000ff00, 0x00000000, 0x00000000 }, /* RVC_FP_REGS */
\
{ 0x00000000, 0xffffffff, 0x00000000, 0x00000000 }, /* FP_REGS */
\
{ 0x00000000, 0x00000000, 0x00000003, 0x00000000 }, /* FRAME_REGS */
\
{ 0x00000000, 0x00000000, 0x00000000, 0x00000001 }, /* V0_REGS */
\
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 69605bf75c0..4ca562266f2 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -3660,6 +3660,13 @@ A vector register, excluding v0 (if available).
@item vm
A vector register, only v0 (if available).
+@item cr
+RVC general purpose register (x8-x15).
+
+@item cf
+RVC floating-point registers (f8-f15), if available, reuse GPR as FPR when use
+zfinx.
+
@end table
@item RX---@file{config/rx/constraints.md}
diff --git a/gcc/testsuite/gcc.target/riscv/constraint-cf-zfinx.c
b/gcc/testsuite/gcc.target/riscv/constraint-cf-zfinx.c
new file mode 100644
index 00000000000..6745f85184c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/constraint-cf-zfinx.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-flto" } { "" } } */
+/* { dg-options "-march=rv64i_zfinx -mabi=lp64" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+void foo(float a0, float a1, float a2, float a3, float a4, float a5, float a6,
float a7, float m0, float m1) {
+/*
+** foo:
+** ...
+** fadd.s\s*t0,\s*(a[0-5]|s[0-1]),\s*(a[0-5]|s[0-1])
+** ...
+*/
+ __asm__ volatile("fadd.s t0, %0, %0" : : "cf" (m0));
+}
diff --git a/gcc/testsuite/gcc.target/riscv/constraint-cf.c
b/gcc/testsuite/gcc.target/riscv/constraint-cf.c
new file mode 100644
index 00000000000..1dc204550bb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/constraint-cf.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-flto" } { "" } } */
+/* { dg-options "-march=rv64if -mabi=lp64" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+void foo(float a0, float a1, float a2, float a3, float a4, float a5, float a6,
float a7, float m0, float m1) {
+/*
+** foo:
+** ...
+** fadd.s\s*ft0,\s*f(a[0-5]|s[0-1]),\s*f(a[0-5]|s[0-1])
+** ...
+*/
+ __asm__ volatile("fadd.s ft0, %0, %0" : : "cf" (m0));
+}
diff --git a/gcc/testsuite/gcc.target/riscv/constraint-cr.c
b/gcc/testsuite/gcc.target/riscv/constraint-cr.c
new file mode 100644
index 00000000000..692ae5753ae
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/constraint-cr.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-flto" } { "" } } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+void foo(int a0, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int
m0, int m1) {
+/*
+** foo:
+** ...
+** addi\s*t0,\s*(a[0-5]|s[0-1]),\s*(a[0-5]|s[0-1])
+** ...
+*/
+ __asm__ volatile("addi t0, %0, %0" : : "cr" (m0) : "memory");
+}
--
2.34.1
