[glibc] RISC-V: Fix llrint and llround missing exceptions on RV32

[glibc] RISC-V: Fix llrint and llround missing exceptions on RV32

[Alistair Francis]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2ed993ada6fc29c0589d4818595df200e1d93a16

commit 2ed993ada6fc29c0589d4818595df200e1d93a16
Author: Zong Li <zongbox@gmail.com>
Date:   Fri Nov 30 17:18:20 2018 +0800

    RISC-V: Fix llrint and llround missing exceptions on RV32
    
    Conversions from a float to a long long on 32-bit RISC-V (RV32) may not
    raise the correct exceptions on overflow, it also may raise spurious
    "inexact" exceptions on non overflow cases.  This patch fixes the
    problem, similarly to the fix for MIPS, ARM and S390.
    
    Reviewed-by: Maciej W. Rozycki <macro@wdc.com>

Diff:
---
 sysdeps/riscv/rv32/fix-fp-int-convert-overflow.h | 38 ++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/sysdeps/riscv/rv32/fix-fp-int-convert-overflow.h b/sysdeps/riscv/rv32/fix-fp-int-convert-overflow.h
new file mode 100644
index 0000000000..ddf9e3c351
--- /dev/null
+++ b/sysdeps/riscv/rv32/fix-fp-int-convert-overflow.h
@@ -0,0 +1,38 @@
+/* Fix for conversion of floating point to integer overflow.  RISC-V version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef FIX_FP_INT_CONVERT_OVERFLOW_H
+#define FIX_FP_INT_CONVERT_OVERFLOW_H	1
+
+/* The generic libgcc2.c conversions from floating point to long long
+   may not raise the correct exceptions on overflow (and may raise
+   spurious "inexact" exceptions even in non-overflow cases, see
+   <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59412>).  */
+#define FIX_FLT_LONG_CONVERT_OVERFLOW 0
+#define FIX_FLT_LLONG_CONVERT_OVERFLOW 1
+
+#define FIX_DBL_LONG_CONVERT_OVERFLOW 0
+#define FIX_DBL_LLONG_CONVERT_OVERFLOW 1
+
+#define FIX_LDBL_LONG_CONVERT_OVERFLOW 0
+#define FIX_LDBL_LLONG_CONVERT_OVERFLOW 0
+
+#define FIX_FLT128_LONG_CONVERT_OVERFLOW 0
+#define FIX_FLT128_LLONG_CONVERT_OVERFLOW 0
+
+#endif /* fix-fp-int-convert-overflow.h */