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target/riscv: Check nanboxed inputs to fp helpers

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If a 32-bit input is not properly nanboxed, then the input is
replaced with the default qnan.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Message-Id: <20200724002807.441147-5-richard.henderson@linaro.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Richard Henderson 2020-07-23 17:28:04 -07:00 • committed by Alistair Francis
parent 40eaa47361
commit 00e925c560
2 changed files with 57 additions and 18 deletions
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11
target/riscv/internals.h
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@ -43,4 +43,15 @@ static inline uint64_t nanbox_s(float32 f)
return f | MAKE_64BIT_MASK(32, 32);
}
static inline float32 check_nanbox_s(uint64_t f)
{
uint64_t mask = MAKE_64BIT_MASK(32, 32);
if (likely((f & mask) == mask)) {
return (uint32_t)f;
} else {
return 0x7fc00000u; /* default qnan */
}
}
#endif