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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 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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1266 ASSERT(allow_macro_instructions_); | 1266 ASSERT(allow_macro_instructions_); |
1267 ASSERT(!rd.IsZero()); | 1267 ASSERT(!rd.IsZero()); |
1268 uxtw(rd, rn); | 1268 uxtw(rd, rn); |
1269 } | 1269 } |
1270 | 1270 |
1271 | 1271 |
1272 void MacroAssembler::BumpSystemStackPointer(const Operand& space) { | 1272 void MacroAssembler::BumpSystemStackPointer(const Operand& space) { |
1273 ASSERT(!csp.Is(sp_)); | 1273 ASSERT(!csp.Is(sp_)); |
1274 // TODO(jbramley): Several callers rely on this not using scratch registers, | 1274 // TODO(jbramley): Several callers rely on this not using scratch registers, |
1275 // so we use the assembler directly here. However, this means that large | 1275 // so we use the assembler directly here. However, this means that large |
1276 // immediate values of 'space' cannot be handled cleanly. Once we implement | 1276 // immediate values of 'space' cannot be handled cleanly. (Only 24-bits |
1277 // our flexible scratch register idea, we could greatly simplify this | 1277 // immediates or values of 'space' that can be encoded in one instruction are |
1278 // function. | 1278 // accepted.) Once we implement our flexible scratch register idea, we could |
| 1279 // greatly simplify this function. |
1279 InstructionAccurateScope scope(this); | 1280 InstructionAccurateScope scope(this); |
1280 if ((space.IsImmediate()) && !is_uint12(space.immediate())) { | 1281 if ((space.IsImmediate()) && !is_uint12(space.immediate())) { |
1281 // The subtract instruction supports a 12-bit immediate, shifted left by | 1282 // The subtract instruction supports a 12-bit immediate, shifted left by |
1282 // zero or 12 bits. So, in two instructions, we can subtract any immediate | 1283 // zero or 12 bits. So, in two instructions, we can subtract any immediate |
1283 // between zero and (1 << 24) - 1. | 1284 // between zero and (1 << 24) - 1. |
1284 int64_t imm = space.immediate(); | 1285 int64_t imm = space.immediate(); |
1285 ASSERT(is_uint24(imm)); | 1286 ASSERT(is_uint24(imm)); |
1286 | 1287 |
1287 int64_t imm_top_12_bits = imm >> 12; | 1288 int64_t imm_top_12_bits = imm >> 12; |
1288 sub(csp, StackPointer(), imm_top_12_bits << 12); | 1289 sub(csp, StackPointer(), imm_top_12_bits << 12); |
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1667 // characters are reserved for controlling features of the instrumentation. | 1668 // characters are reserved for controlling features of the instrumentation. |
1668 ASSERT(isprint(marker_name[0]) && isprint(marker_name[1])); | 1669 ASSERT(isprint(marker_name[0]) && isprint(marker_name[1])); |
1669 | 1670 |
1670 InstructionAccurateScope scope(this, 1); | 1671 InstructionAccurateScope scope(this, 1); |
1671 movn(xzr, (marker_name[1] << 8) | marker_name[0]); | 1672 movn(xzr, (marker_name[1] << 8) | marker_name[0]); |
1672 } | 1673 } |
1673 | 1674 |
1674 } } // namespace v8::internal | 1675 } } // namespace v8::internal |
1675 | 1676 |
1676 #endif // V8_A64_MACRO_ASSEMBLER_A64_INL_H_ | 1677 #endif // V8_A64_MACRO_ASSEMBLER_A64_INL_H_ |
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