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Issue 6303012: Truncate rather than round to nearest when performing float-to-integer... (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 9 years, 11 months ago
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1 // Copyright 2009 the V8 project authors. All rights reserved. 1 // Copyright 2009 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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1106 } 1106 }
1107 } else if (opcode == 0x2A) { 1107 } else if (opcode == 0x2A) {
1108 // CVTSI2SS: integer to XMM single conversion. 1108 // CVTSI2SS: integer to XMM single conversion.
1109 int mod, regop, rm; 1109 int mod, regop, rm;
1110 get_modrm(*current, &mod, &regop, &rm); 1110 get_modrm(*current, &mod, &regop, &rm);
1111 AppendToBuffer("%ss %s,", mnemonic, NameOfXMMRegister(regop)); 1111 AppendToBuffer("%ss %s,", mnemonic, NameOfXMMRegister(regop));
1112 current += PrintRightOperand(current); 1112 current += PrintRightOperand(current);
1113 } else if (opcode == 0x2C) { 1113 } else if (opcode == 0x2C) {
1114 // CVTTSS2SI: 1114 // CVTTSS2SI:
1115 // Convert with truncation scalar single-precision FP to dword integer. 1115 // Convert with truncation scalar single-precision FP to dword integer.
1116 // Assert that mod is not 3, so source is memory, not an XMM register. 1116 int mod, regop, rm;
1117 ASSERT_NE(0xC0, *current & 0xC0); 1117 get_modrm(*current, &mod, &regop, &rm);
1118 current += PrintOperands("cvttss2si", REG_OPER_OP_ORDER, current); 1118 AppendToBuffer("cvttss2si%c %s,",
1119 operand_size_code(), NameOfCPURegister(regop));
1120 current += PrintRightXMMOperand(current);
1119 } else if (opcode == 0x5A) { 1121 } else if (opcode == 0x5A) {
1120 // CVTSS2SD: 1122 // CVTSS2SD:
1121 // Convert scalar single-precision FP to scalar double-precision FP. 1123 // Convert scalar single-precision FP to scalar double-precision FP.
1122 int mod, regop, rm; 1124 int mod, regop, rm;
1123 get_modrm(*current, &mod, &regop, &rm); 1125 get_modrm(*current, &mod, &regop, &rm);
1124 AppendToBuffer("cvtss2sd %s,", NameOfXMMRegister(regop)); 1126 AppendToBuffer("cvtss2sd %s,", NameOfXMMRegister(regop));
1125 current += PrintRightXMMOperand(current); 1127 current += PrintRightXMMOperand(current);
1126 } else { 1128 } else {
1127 UnimplementedInstruction(); 1129 UnimplementedInstruction();
1128 } 1130 }
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1712 for (int i = 6 - static_cast<int>(pc - prev_pc); i >= 0; i--) { 1714 for (int i = 6 - static_cast<int>(pc - prev_pc); i >= 0; i--) {
1713 fprintf(f, " "); 1715 fprintf(f, " ");
1714 } 1716 }
1715 fprintf(f, " %s\n", buffer.start()); 1717 fprintf(f, " %s\n", buffer.start());
1716 } 1718 }
1717 } 1719 }
1718 1720
1719 } // namespace disasm 1721 } // namespace disasm
1720 1722
1721 #endif // V8_TARGET_ARCH_X64 1723 #endif // V8_TARGET_ARCH_X64
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