RISC-V: Fix ICE of RVV compare intrinsic

vfrsub_vf_m.cpp: In function 'int main()':
vfrsub_vf_m.cpp:5:43: error: invalid argument to built-in function
   5 |   vbool32_t d = __riscv_vmflt_vf_f32m1_b32(c, b, 8);
     |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
during RTL pass: expand
vfrsub_vf_m.cpp:5:43: internal compiler error: Segmentation fault
0x19f1b89 crash_signal
       ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/toplev.cc:314
0x1472e2f store_expr(tree_node*, rtx_def*, int, bool, bool)
       ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/expr.cc:6348

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins.cc
	(function_expander::use_compare_insn): Add operand predicate check.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/bug-1.c: New test.

2 files changed, 88 insertions, 0 deletions

diff --git a/gcc/config/riscv/riscv-vector-builtins.cc b/gcc/config/riscv/riscv-vector-builtins.cc
index fcda386..75e6509 100644
--- a/gcc/config/riscv/riscv-vector-builtins.cc
+++ b/gcc/config/riscv/riscv-vector-builtins.cc
@@ -3084,6 +3084,15 @@ function_expander::use_compare_insn (rtx_code rcode, insn_code icode)
 
   rtx op1 = expand_normal (CALL_EXPR_ARG (exp, arg_offset++));
   rtx op2 = expand_normal (CALL_EXPR_ARG (exp, arg_offset++));
+  if (!insn_operand_matches (icode, opno + 1, op1))
+    op1 = force_reg (mode, op1);
+  if (!insn_operand_matches (icode, opno + 2, op2))
+    {
+      if (VECTOR_MODE_P (GET_MODE (op2)))
+	op2 = force_reg (mode, op2);
+      else
+	op2 = force_reg (GET_MODE_INNER (mode), op2);
+    }
   rtx comparison = gen_rtx_fmt_ee (rcode, mask_mode, op1, op2);
   if (!VECTOR_MODE_P (GET_MODE (op2)))
     comparison = gen_rtx_fmt_ee (rcode, mask_mode, op1,
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/bug-1.c b/gcc/testsuite/gcc.target/riscv/rvv/base/bug-1.c
new file mode 100644
index 0000000..a884367
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/bug-1.c
@@ -0,0 +1,79 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv32gcv -mabi=ilp32d -O0" } */
+
+#include "riscv_vector.h"
+
+int
+f0 ()
+{
+  float b;
+  vfloat32m1_t c;
+  vbool32_t d = __riscv_vmflt_vf_f32m1_b32 (c, b, 8);
+  return 0;
+}
+
+int
+f1 ()
+{
+  vfloat32m1_t c;
+  vbool32_t d = __riscv_vmflt_vf_f32m1_b32 (c, 0, 8);
+  return 0;
+}
+
+int
+f2 ()
+{
+  vfloat32m1_t c;
+  vbool32_t d = __riscv_vmflt_vf_f32m1_b32 (c, 55.55, 8);
+  return 0;
+}
+
+int
+f3 ()
+{
+  int32_t b;
+  vint32m1_t c;
+  vbool32_t d = __riscv_vmseq_vx_i32m1_b32 (c, b, 8);
+  return 0;
+}
+
+int
+f4 ()
+{
+  vint32m1_t c;
+  vbool32_t d = __riscv_vmseq_vx_i32m1_b32 (c, 11, 8);
+  return 0;
+}
+
+int
+f5 ()
+{
+  int64_t b;
+  vint64m1_t c;
+  vbool64_t d = __riscv_vmseq_vx_i64m1_b64 (c, b, 8);
+  return 0;
+}
+
+int
+f6 ()
+{
+  vint64m1_t c;
+  vbool64_t d = __riscv_vmseq_vx_i64m1_b64 (c, 11, 8);
+  return 0;
+}
+
+int
+f7 ()
+{
+  vint64m1_t c;
+  vbool64_t d = __riscv_vmseq_vx_i64m1_b64 (c, 0xAAAA, 8);
+  return 0;
+}
+
+int
+f8 ()
+{
+  vint64m1_t c;
+  vbool64_t d = __riscv_vmseq_vx_i64m1_b64 (c, 0xAAAAAAAAAAAAAA, 8);
+  return 0;
+}