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The x86 architecture requires that all conversions from floating point to integer which raise the 'invalid' exception (infinities of both signs, NaN, and all values which don't fit in the destination integer) return what the x86 spec calls the "indefinite integer value", which is 0x8000_0000 for 32-bits or 0x8000_0000_0000_0000 for 64-bits. The softfloat functions return the more usual behaviour of positive overflows returning the maximum value that fits in the destination integer format and negative overflows returning the minimum value that fits. Wrap the softfloat functions in x86-specific versions which detect the 'invalid' condition and return the indefinite integer. Note that we don't use these wrappers for the 3DNow! pf2id and pf2iw instructions, which do return the minimum value that fits in an int32 if the input float is a large negative number. Fixes: https://bugs.launchpad.net/qemu/+bug/1815423 Backports commit 1e8a98b53867f61da9ca09f411288e2085d323c4 from qemu |
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