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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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1715 static const uint32_t exponent_word_for_1 = | 1715 static const uint32_t exponent_word_for_1 = |
1716 kBinary32ExponentBias << kBinary32ExponentShift; | 1716 kBinary32ExponentBias << kBinary32ExponentShift; |
1717 | 1717 |
1718 __ orr(fval, fval, Operand(exponent_word_for_1), LeaveCC, eq); | 1718 __ orr(fval, fval, Operand(exponent_word_for_1), LeaveCC, eq); |
1719 __ b(&done); | 1719 __ b(&done); |
1720 | 1720 |
1721 __ bind(¬_special); | 1721 __ bind(¬_special); |
1722 // Count leading zeros. | 1722 // Count leading zeros. |
1723 // Gets the wrong answer for 0, but we already checked for that case above. | 1723 // Gets the wrong answer for 0, but we already checked for that case above. |
1724 Register zeros = scratch2; | 1724 Register zeros = scratch2; |
1725 __ CountLeadingZeros(ival, scratch1, zeros); | 1725 __ CountLeadingZeros(zeros, ival, scratch1); |
1726 | 1726 |
1727 // Compute exponent and or it into the exponent register. | 1727 // Compute exponent and or it into the exponent register. |
1728 __ rsb(scratch1, | 1728 __ rsb(scratch1, |
1729 zeros, | 1729 zeros, |
1730 Operand((kBitsPerInt - 1) + kBinary32ExponentBias)); | 1730 Operand((kBitsPerInt - 1) + kBinary32ExponentBias)); |
1731 | 1731 |
1732 __ orr(fval, | 1732 __ orr(fval, |
1733 fval, | 1733 fval, |
1734 Operand(scratch1, LSL, kBinary32ExponentShift)); | 1734 Operand(scratch1, LSL, kBinary32ExponentShift)); |
1735 | 1735 |
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2137 GenerateMiss(masm); | 2137 GenerateMiss(masm); |
2138 } | 2138 } |
2139 | 2139 |
2140 | 2140 |
2141 #undef __ | 2141 #undef __ |
2142 | 2142 |
2143 | 2143 |
2144 } } // namespace v8::internal | 2144 } } // namespace v8::internal |
2145 | 2145 |
2146 #endif // V8_TARGET_ARCH_ARM | 2146 #endif // V8_TARGET_ARCH_ARM |
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