RISC-V: Fix incorrect VTYPE fusion for floating point scalar move insn[PR111037]

void foo(_Float16 y, int64_t *i64p)
{
  vint64m1_t vx =__riscv_vle64_v_i64m1 (i64p, 1);
  vx = __riscv_vadd_vv_i64m1 (vx, vx, 1);
  vfloat16m1_t vy =__riscv_vfmv_s_f_f16m1 (y, 1);
  asm volatile ("# use %0 %1" : : "vr"(vx), "vr" (vy));
}

zve64f:
foo:
	vsetivli	zero,1,e16,mf4,ta,ma
	vle64.v	v1,0(a0)
	vfmv.s.f	v2,fa0
	vsetvli	zero,zero,e64,m1,ta,ma
	vadd.vv	v1,v1,v1

zve64d:
foo:
	vsetivli	zero,1,e64,m1,ta,ma
	vle64.v	v1,0(a0)
	vfmv.s.f	v2,fa0
	vadd.vv	v1,v1,v1

gcc/ChangeLog:

	PR target/111037
	* config/riscv/riscv-vsetvl.cc (float_insn_valid_sew_p): New function.
	(second_sew_less_than_first_sew_p): Fix bug.
	(first_sew_less_than_second_sew_p): Ditto.

gcc/testsuite/ChangeLog:

	PR target/111037
	* gcc.target/riscv/rvv/base/pr111037-1.c: New test.
	* gcc.target/riscv/rvv/base/pr111037-2.c: New test.

3 files changed, 43 insertions, 2 deletions

diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index 08c487d..79cbac0 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -1184,17 +1184,35 @@ second_ratio_invalid_for_first_lmul_p (const vector_insn_info &info1,
 }
 
 static bool
+float_insn_valid_sew_p (const vector_insn_info &info, unsigned int sew)
+{
+  if (info.get_insn () && info.get_insn ()->is_real ()
+      && get_attr_type (info.get_insn ()->rtl ()) == TYPE_VFMOVFV)
+    {
+      if (sew == 16)
+	return TARGET_VECTOR_ELEN_FP_16;
+      else if (sew == 32)
+	return TARGET_VECTOR_ELEN_FP_32;
+      else if (sew == 64)
+	return TARGET_VECTOR_ELEN_FP_64;
+    }
+  return true;
+}
+
+static bool
 second_sew_less_than_first_sew_p (const vector_insn_info &info1,
 				  const vector_insn_info &info2)
 {
-  return info2.get_sew () < info1.get_sew ();
+  return info2.get_sew () < info1.get_sew ()
+	 || !float_insn_valid_sew_p (info1, info2.get_sew ());
 }
 
 static bool
 first_sew_less_than_second_sew_p (const vector_insn_info &info1,
 				  const vector_insn_info &info2)
 {
-  return info1.get_sew () < info2.get_sew ();
+  return info1.get_sew () < info2.get_sew ()
+	 || !float_insn_valid_sew_p (info2, info1.get_sew ());
 }
 
 /* return 0 if LMUL1 == LMUL2.
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr111037-1.c b/gcc/testsuite/gcc.target/riscv/rvv/base/pr111037-1.c
new file mode 100644
index 0000000..0b7b32f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr111037-1.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gc_zve64f_zvfh -mabi=ilp32d -O3" } */
+
+#include "riscv_vector.h"
+
+void foo(_Float16 y, int64_t *i64p)
+{
+  vint64m1_t vx =__riscv_vle64_v_i64m1 (i64p, 1);
+  vx = __riscv_vadd_vv_i64m1 (vx, vx, 1);
+  vfloat16m1_t vy =__riscv_vfmv_s_f_f16m1 (y, 1);
+  asm volatile ("# use %0 %1" : : "vr"(vx), "vr" (vy));
+}
+
+/* { dg-final { scan-assembler-times {vsetivli\s+zero,\s*1,\s*e16,\s*mf4,\s*t[au],\s*m[au]} 1 } } */
+/* { dg-final { scan-assembler-times {vsetvli\s+zero,\s*zero,\s*e64,\s*m1,\s*t[au],\s*m[au]} 1 } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr111037-2.c b/gcc/testsuite/gcc.target/riscv/rvv/base/pr111037-2.c
new file mode 100644
index 0000000..ac50da7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr111037-2.c
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gc_zve64d_zvfh -mabi=ilp32d -O3" } */
+
+#include "pr111037-1.c"
+
+/* { dg-final { scan-assembler-times {vsetivli\s+zero,\s*1,\s*e64,\s*m1,\s*t[au],\s*m[au]} 1 } } */
+/* { dg-final { scan-assembler-not {vsetvli} } } */
+/* { dg-final { scan-assembler-times {vsetivli} 1 } } */