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From: Corinna Vinschen <corinna@sourceware.org> To: newlib-cvs@sourceware.org Subject: [newlib-cygwin/main] RISC-V: Fix floating-point environment support for soft float Date: Fri, 27 Jan 2023 13:25:55 +0000 (GMT) [thread overview] Message-ID: <20230127132555.E3ED63858C74@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=963d6c79ead3941b399e3549bc753c2cb90ab79b commit 963d6c79ead3941b399e3549bc753c2cb90ab79b Author: Maciej W. Rozycki <macro@embecosm.com> AuthorDate: Fri Jan 27 08:53:35 2023 +0000 Commit: Corinna Vinschen <corinna@vinschen.de> CommitDate: Fri Jan 27 14:25:44 2023 +0100 RISC-V: Fix floating-point environment support for soft float We don't have floating-point exception or non-default rounding mode support for the RISC-V soft-float environment, `feraiseexcept' and `fesetround' do nothing unless the `__riscv_flen' macro has been set. Therefore following ISO C language requirements[1] only define macros for soft float that correspond to actually supported floating-point environment features, removing failures from GCC testing such as: FAIL: gcc.dg/torture/fp-int-convert-timode-3.c -O0 execution test FAIL: gcc.dg/torture/fp-int-convert-timode-4.c -O0 execution test References: [1] "Programming languages -- C", ISO/IEC 9899:2023, working draft -- September 3, 2022, Section 7.6 "Floating-point environment <fenv.h>" Fixes: 7040b2de0883 ("Add RISC-V port for libm") Signed-off-by: Maciej W. Rozycki <macro@embecosm.com> Diff: --- newlib/libc/machine/riscv/sys/fenv.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/newlib/libc/machine/riscv/sys/fenv.h b/newlib/libc/machine/riscv/sys/fenv.h index 6cbd321f3499..772f3833f4a4 100644 --- a/newlib/libc/machine/riscv/sys/fenv.h +++ b/newlib/libc/machine/riscv/sys/fenv.h @@ -14,6 +14,8 @@ #include <stddef.h> +#if __riscv_flen + /* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA: * Version 2.1", Section 8.2, "Floating-Point Control and Status * Register": @@ -69,6 +71,13 @@ * floating-point unit." */ +#else /* !__riscv_flen */ + +#define FE_ALL_EXCEPT 0x00000000 +#define FE_TONEAREST 0x00000000 + +#endif /* !__riscv_flen */ + typedef size_t fenv_t; typedef size_t fexcept_t; extern const fenv_t fe_dfl_env;
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