[PATCH v3 2/2] RISC-V: Improve "bits undefined" diagnostics

[Tsukasa OI <research_trasio@irq.a4lg.com>]

This commit improves internal error message
"internal: bad RISC-V opcode (bits 0x%lx undefined): %s %s"
to display actual unused bits (excluding non-instruction bits).

gas/ChangeLog:

	* config/tc-riscv.c (validate_riscv_insn): Exclude non-
	instruction bits from displaying internal diagnostics.
	Change error message slightly.
---
 gas/config/tc-riscv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index 41d6dfc6062..dacfe0f1d25 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -1313,8 +1313,8 @@ validate_riscv_insn (const struct riscv_opcode *opc, int length)
   if (used_bits != required_bits)
     {
       as_bad (_("internal: bad RISC-V opcode "
-		"(bits 0x%lx undefined): %s %s"),
-	      ~(unsigned long)(used_bits & required_bits),
+		"(bits %#llx undefined or invalid): %s %s"),
+	      (unsigned long long)(used_bits ^ required_bits),
 	      opc->name, opc->args);
       return false;
     }
-- 
2.34.1