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RISC-V: Fix floating-point environment support for soft float

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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>
This commit is contained in:
Maciej W. Rozycki 2023-01-27 08:53:35 +00:00 committed by Corinna Vinschen
parent 28594480df
commit 963d6c79ea
1 changed files with 9 additions and 0 deletions
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9
newlib/libc/machine/riscv/sys/fenv.h
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@ -14,6 +14,8 @@
#include <stddef.h> #include <stddef.h>
#if __riscv_flen
/* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA: /* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA:
* Version 2.1", Section 8.2, "Floating-Point Control and Status * Version 2.1", Section 8.2, "Floating-Point Control and Status
* Register": * Register":
@ -69,6 +71,13 @@
* floating-point unit." * 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 fenv_t;
typedef size_t fexcept_t; typedef size_t fexcept_t;
extern const fenv_t fe_dfl_env; extern const fenv_t fe_dfl_env;