From: Hau Hsu <hau.hsu@sifive.com>
To: hau.hsu@sifive.com, kito.cheng@sifive.com, newlib@sourceware.org
Subject: [PATCH 1/1] RISC-V: Use the new libm code if possible
Date: Wed, 22 Feb 2023 09:59:07 +0800 [thread overview]
Message-ID: <20230222015907.43288-1-hau.hsu@sifive.com> (raw)
Set __OBSOLETE_MATH_DEFAULT to 0 if 'd' extension is supported (i.e.
__riscv_flen == 64).
Base on the comment for __OBSOLETE_MATH_DEFAULT:
> ... it assumes that the toolchain has ISO C99 support (hexfloat
> literals, standard fenv semantics), the target has IEEE-754 conforming
> binary32 float and binary64 double (not mixed endian) representation,
> standard SNaN representation, double and single precision arithmetics
> has similar latency and it has no legacy SVID matherr support, only
> POSIX errno and fenv exception based error handling.
Signed-off-by: Hau Hsu <hau.hsu@sifive.com>
---
newlib/libc/include/machine/ieeefp.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/newlib/libc/include/machine/ieeefp.h b/newlib/libc/include/machine/ieeefp.h
index 9bb8af02f..a29557a6d 100644
--- a/newlib/libc/include/machine/ieeefp.h
+++ b/newlib/libc/include/machine/ieeefp.h
@@ -221,6 +221,11 @@
#ifdef __riscv_flen
# define _SUPPORTS_ERREXCEPT
#endif
+#if __riscv_flen == 64
+# define __OBSOLETE_MATH_DEFAULT 0
+#else
+# define __OBSOLETE_MATH_DEFAULT 1
+#endif
#endif
#ifdef __i960__
--
2.39.0
next reply other threads:[~2023-02-22 1:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-22 1:59 Hau Hsu [this message]
2023-02-22 3:18 ` Kito Cheng
2023-02-22 11:29 ` Corinna Vinschen
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