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armemu: Fix FSUBS bug where NaN shouldn't be negated
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@ -1148,7 +1148,10 @@ static u32 vfp_single_fsub(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
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/*
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* Subtraction is addition with one sign inverted.
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*/
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return vfp_single_fadd(state, sd, sn, vfp_single_packed_negate(m), fpscr);
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if (m != 0x7FC00000) // Only negate if m isn't NaN.
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m = vfp_single_packed_negate(m);
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return vfp_single_fadd(state, sd, sn, m, fpscr);
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}
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/*
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