RISC-V: Enable builtin __riscv_mul with Zmmul extension.

From d5b254e19d1f37fe27c7e98a0160e5c22446cfea Mon Sep 17 00:00:00 2001
From: Jim Lin <[email protected]>
Date: Tue, 8 Oct 2024 13:14:32 +0800
Subject: [PATCH] RISC-V: Enable builtin __riscv_mul with Zmmul extension.

gcc/ChangeLog:

	* config/riscv/riscv-c.cc: (riscv_cpu_cpp_builtins):
	Enable builtin __riscv_mul with Zmmul extension.

Author: tclin914

gcc/config/riscv/riscv-c.cc

@@ -123,7 +123,7 @@ riscv_cpu_cpp_builtins (cpp_reader *pfile)
   if (TARGET_ATOMIC)
     builtin_define ("__riscv_atomic");
 
-  if (TARGET_MUL)
+  if (TARGET_ZMMUL)
     builtin_define ("__riscv_mul");
   if (TARGET_DIV)
     builtin_define ("__riscv_div");