1/*
2 * Copyright (c) 2010 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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101{
102 VfpRoundNearest = 0,
103 VfpRoundUpward = 1,
104 VfpRoundDown = 2,
105 VfpRoundZero = 3
106};
107
108template <class fpType>
109static inline bool
110flushToZero(fpType &op)
111{
112 fpType junk = 0.0;
113 if (std::fpclassify(op) == FP_SUBNORMAL) {
114 uint64_t bitMask = ULL(0x1) << (sizeof(fpType) * 8 - 1);
115 op = bitsToFp(fpToBits(op) & bitMask, junk);
116 return true;

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122static inline bool
123flushToZero(fpType &op1, fpType &op2)
124{
125 bool flush1 = flushToZero(op1);
126 bool flush2 = flushToZero(op2);
127 return flush1 || flush2;
128}
129
130template <class fpType>
131static inline void
132vfpFlushToZero(FPSCR &fpscr, fpType &op)
133{
134 if (fpscr.fz == 1 && flushToZero(op)) {
135 fpscr.idc = 1;
136 }
137}
138
139template <class fpType>
140static inline void
141vfpFlushToZero(FPSCR &fpscr, fpType &op1, fpType &op2)
142{
143 vfpFlushToZero(fpscr, op1);
144 vfpFlushToZero(fpscr, op2);
145}
146
147static inline uint32_t
148fpToBits(float fp)
149{
150 union
151 {
152 float fp;
153 uint32_t bits;
154 } val;

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190 } val;
191 val.bits = bits;
192 return val.fp;
193}
194
195typedef int VfpSavedState;
196
197static inline VfpSavedState
198prepFpState(uint32_t rMode)
199{
200 int roundingMode = fegetround();
201 feclearexcept(FeAllExceptions);
202 switch (rMode) {
203 case VfpRoundNearest:
204 fesetround(FeRoundNearest);
205 break;

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211 break;
212 case VfpRoundZero:
213 fesetround(FeRoundZero);
214 break;
215 }
216 return roundingMode;
217}
218
219static inline void
220finishVfp(FPSCR &fpscr, VfpSavedState state)
221{
222 int exceptions = fetestexcept(FeAllExceptions);
223 bool underflow = false;
224 if (exceptions & FeInvalid) {
225 fpscr.ioc = 1;
226 }

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