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Diffstat (limited to 'deps/v8/src/utils.h')
| -rw-r--r-- | deps/v8/src/utils.h | 26 |
1 files changed, 0 insertions, 26 deletions
diff --git a/deps/v8/src/utils.h b/deps/v8/src/utils.h index f116c14db..1d40c98b9 100644 --- a/deps/v8/src/utils.h +++ b/deps/v8/src/utils.h @@ -85,32 +85,6 @@ inline int WhichPowerOf2(uint32_t x) { } -// Magic numbers for integer division. -// These are kind of 2's complement reciprocal of the divisors. -// Details and proofs can be found in: -// - Hacker's Delight, Henry S. Warren, Jr. -// - The PowerPC Compiler Writer’s Guide -// and probably many others. -// See details in the implementation of the algorithm in -// lithium-codegen-arm.cc : LCodeGen::TryEmitSignedIntegerDivisionByConstant(). -struct DivMagicNumbers { - unsigned M; - unsigned s; -}; - -const DivMagicNumbers InvalidDivMagicNumber= {0, 0}; -const DivMagicNumbers DivMagicNumberFor3 = {0x55555556, 0}; -const DivMagicNumbers DivMagicNumberFor5 = {0x66666667, 1}; -const DivMagicNumbers DivMagicNumberFor7 = {0x92492493, 2}; -const DivMagicNumbers DivMagicNumberFor9 = {0x38e38e39, 1}; -const DivMagicNumbers DivMagicNumberFor11 = {0x2e8ba2e9, 1}; -const DivMagicNumbers DivMagicNumberFor25 = {0x51eb851f, 3}; -const DivMagicNumbers DivMagicNumberFor125 = {0x10624dd3, 3}; -const DivMagicNumbers DivMagicNumberFor625 = {0x68db8bad, 8}; - -const DivMagicNumbers DivMagicNumberFor(int32_t divisor); - - // The C++ standard leaves the semantics of '>>' undefined for // negative signed operands. Most implementations do the right thing, // though. |