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* [newlib-cygwin/main] RISC-V: Use the new libm code if possible
@ 2023-02-22 11:21 Corinna Vinschen
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From: Corinna Vinschen @ 2023-02-22 11:21 UTC (permalink / raw)
To: newlib-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=97d483c2f81c0865bead701f4d2824a21fae4938
commit 97d483c2f81c0865bead701f4d2824a21fae4938
Author: Hau Hsu <hau.hsu@sifive.com>
AuthorDate: Wed Feb 22 09:59:07 2023 +0800
Commit: Corinna Vinschen <corinna@vinschen.de>
CommitDate: Wed Feb 22 12:20:57 2023 +0100
RISC-V: Use the new libm code if possible
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>
Diff:
---
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 9bb8af02f455..a29557a6d00c 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__
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