RISC-V: Support FP SGNJX autovec for VLS mode

This patch would like to allow the VLS mode autovec for the
floating-point binary operation SGNJX.

Give sample code as below:

void
test (float * restrict out, float * restrict in1, float * restrict in2)
{
  for (int i = 0; i < 128; i++)
    out[i] = in1[i] * copysignf (1.0, in2[i]);
}

Before this patch:
test:
  li      a5,128
  vsetvli zero,a5,e32,m1,ta,ma
  vle32.v v2,0(a1)
  lui     a4,%hi(.LC0)
  flw     fa5,%lo(.LC0)(a4)
  vfmv.v.f        v1,fa5
  vle32.v v3,0(a2)
  vfsgnj.vv       v1,v1,v3
  vfmul.vv        v1,v1,v2
  vse32.v v1,0(a0)
  ret

After this patch:
test:
  li      a5,128
  vsetvli zero,a5,e32,m1,ta,ma
  vle32.v v1,0(a1)
  vle32.v v2,0(a2)
  vfsgnjx.vv      v1,v1,v2
  vse32.v v1,0(a0)
  ret

This SGNJX autovec acts on function call copysignf/copysignf
in math.h too. And it depends on the option -ffast-math.

gcc/ChangeLog:

	* config/riscv/autovec-vls.md (xorsign<mode>3): New pattern.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/vls/def.h: New macro.
	* gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-2.c: New test.

Signed-off-by: Pan Li <pan2.li@intel.com>

4 files changed, 103 insertions, 0 deletions

diff --git a/gcc/config/riscv/autovec-vls.md b/gcc/config/riscv/autovec-vls.md
index 6f48f7d..d4ed208 100644
--- a/gcc/config/riscv/autovec-vls.md
+++ b/gcc/config/riscv/autovec-vls.md
@@ -289,6 +289,27 @@
   [(set_attr "type" "vector")]
 )
 
+;; -------------------------------------------------------------------------
+;; Includes:
+;; - vfsgnjx.vv
+;; - vfsgnjx.vf
+;; -------------------------------------------------------------------------
+(define_insn_and_split "xorsign<mode>3"
+  [(set (match_operand:VLSF 0 "register_operand")
+    (unspec:VLSF
+      [(match_operand:VLSF  1 "register_operand")
+       (match_operand:VLSF  2 "register_operand")] UNSPEC_VXORSIGN))]
+  "TARGET_VECTOR && can_create_pseudo_p ()"
+  "#"
+  "&& 1"
+  [(const_int 0)]
+  {
+    riscv_vector::emit_vlmax_insn (code_for_pred (UNSPEC_VXORSIGN, <MODE>mode),
+				   riscv_vector::BINARY_OP, operands);
+    DONE;
+  }
+)
+
 ;; -------------------------------------------------------------------------------
 ;; ---- [INT] Unary operations
 ;; -------------------------------------------------------------------------------
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/def.h b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/def.h
index 1edc191..81c4570 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/def.h
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/def.h
@@ -258,3 +258,11 @@ typedef double v512df __attribute__ ((vector_size (4096)));
     for (int i = 0; i < NUM; ++i)                                              \
       a[i] = (b[i] > c[i]) OP (d[i] < e[i]);                                   \
   }
+
+#define DEF_SGNJX_VV(PREFIX, NUM, TYPE, CALL)                                  \
+  void __attribute__ ((noinline, noclone))                                     \
+  PREFIX##_##TYPE##NUM (TYPE *restrict a, TYPE *restrict b, TYPE *restrict c)  \
+  {                                                                            \
+    for (int i = 0; i < NUM; ++i)                                              \
+      a[i] = b[i] * CALL (1.0, c[i]);                                          \
+  }
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-1.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-1.c
new file mode 100644
index 0000000..86c23ef
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-1.c
@@ -0,0 +1,43 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv_zvfh_zvl4096b -mabi=lp64d -O3 -fno-schedule-insns -fno-schedule-insns2 --param=riscv-autovec-lmul=m8 -ffast-math" } */
+
+#include "def.h"
+
+DEF_SGNJX_VV (sgnj, 1, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 2, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 4, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 8, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 16, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 32, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 64, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 128, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 256, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 512, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 1024, _Float16, __builtin_copysignf16)
+DEF_SGNJX_VV (sgnj, 2048, _Float16, __builtin_copysignf16)
+
+DEF_SGNJX_VV (sgnj, 1, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 2, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 4, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 8, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 16, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 32, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 64, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 128, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 256, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 512, float, __builtin_copysignf)
+DEF_SGNJX_VV (sgnj, 1024, float, __builtin_copysignf)
+
+DEF_SGNJX_VV (sgnj, 1, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 2, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 4, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 8, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 16, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 32, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 64, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 128, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 256, double, __builtin_copysign)
+DEF_SGNJX_VV (sgnj, 512, double, __builtin_copysign)
+
+/* { dg-final { scan-assembler-times {vfsgnjx\.vv\s+v[0-9]+,\s*v[0-9]+,\s*v[0-9]+} 30 } } */
+/* { dg-final { scan-assembler-not {csrr} } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-2.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-2.c
new file mode 100644
index 0000000..7e017de
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls/floating-point-sgnjx-2.c
@@ -0,0 +1,31 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gcv_zvfh_zvl4096b -mabi=lp64d -O3 -fno-schedule-insns -fno-schedule-insns2 --param=riscv-autovec-lmul=m8 -ffast-math" } */
+
+#include "def.h"
+#include <math.h>
+
+DEF_SGNJX_VV (sgnj, 1, float, copysignf)
+DEF_SGNJX_VV (sgnj, 2, float, copysignf)
+DEF_SGNJX_VV (sgnj, 4, float, copysignf)
+DEF_SGNJX_VV (sgnj, 8, float, copysignf)
+DEF_SGNJX_VV (sgnj, 16, float, copysignf)
+DEF_SGNJX_VV (sgnj, 32, float, copysignf)
+DEF_SGNJX_VV (sgnj, 64, float, copysignf)
+DEF_SGNJX_VV (sgnj, 128, float, copysignf)
+DEF_SGNJX_VV (sgnj, 256, float, copysignf)
+DEF_SGNJX_VV (sgnj, 512, float, copysignf)
+DEF_SGNJX_VV (sgnj, 1024, float, copysignf)
+
+DEF_SGNJX_VV (sgnj, 1, double, copysign)
+DEF_SGNJX_VV (sgnj, 2, double, copysign)
+DEF_SGNJX_VV (sgnj, 4, double, copysign)
+DEF_SGNJX_VV (sgnj, 8, double, copysign)
+DEF_SGNJX_VV (sgnj, 16, double, copysign)
+DEF_SGNJX_VV (sgnj, 32, double, copysign)
+DEF_SGNJX_VV (sgnj, 64, double, copysign)
+DEF_SGNJX_VV (sgnj, 128, double, copysign)
+DEF_SGNJX_VV (sgnj, 256, double, copysign)
+DEF_SGNJX_VV (sgnj, 512, double, copysign)
+
+/* { dg-final { scan-assembler-times {vfsgnjx\.vv\s+v[0-9]+,\s*v[0-9]+,\s*v[0-9]+} 19 } } */
+/* { dg-final { scan-assembler-not {csrr} } } */