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M1499198

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This commit is contained in:
Riccardo Mottola 2018-10-23 22:01:37 +02:00
parent 2336e65d15
commit 4c22259661
1 changed files with 19 additions and 11 deletions
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30
js/src/jit/x86/MacroAssembler-x86.cpp
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@ -21,14 +21,6 @@
using namespace js;
using namespace js::jit;
// vpunpckldq requires 16-byte boundary for memory operand.
// See convertUInt64ToDouble for the details.
MOZ_ALIGNED_DECL(static const uint64_t, 16) TO_DOUBLE[4] = {
0x4530000043300000LL,
0x0LL,
0x4330000000000000LL,
0x4530000000000000LL
};
static const double TO_DOUBLE_HIGH_SCALE = 0x100000000;
@ -71,8 +63,16 @@ MacroAssemblerX86::convertUInt64ToDouble(Register64 src, Register temp, FloatReg
// here, each 64-bit part of dest represents following double:
// HI(dest) = 0x 1.00000HHHHHHHH * 2**84 == 2**84 + 0x HHHHHHHH 00000000
// LO(dest) = 0x 1.00000LLLLLLLL * 2**52 == 2**52 + 0x 00000000 LLLLLLLL
movePtr(ImmPtr(TO_DOUBLE), temp);
vpunpckldq(Operand(temp, 0), dest128, dest128);
// See convertUInt64ToDouble for the details.
static const int32_t CST1[4] = {
0x43300000,
0x45300000,
0x0,
0x0,
};
loadConstantSimd128Int(SimdConstant::CreateX4(CST1), ScratchSimd128Reg);
vpunpckldq(ScratchSimd128Reg, dest128, dest128);
// Subtract a constant C2 from dest, for each 64-bit part:
// C2 = 0x 45300000 00000000 43300000 00000000
@ -82,7 +82,15 @@ MacroAssemblerX86::convertUInt64ToDouble(Register64 src, Register temp, FloatReg
// after the operation each 64-bit part of dest represents following:
// HI(dest) = double(0x HHHHHHHH 00000000)
// LO(dest) = double(0x 00000000 LLLLLLLL)
vsubpd(Operand(temp, sizeof(uint64_t) * 2), dest128, dest128);
static const int32_t CST2[4] = {
0x0,
0x43300000,
0x0,
0x45300000,
};
loadConstantSimd128Int(SimdConstant::CreateX4(CST2), ScratchSimd128Reg);
vsubpd(ScratchSimd128Reg, dest128, dest128);
// Add HI(dest) and LO(dest) in double and store it into LO(dest),
// LO(dest) = double(0x HHHHHHHH 00000000) + double(0x 00000000 LLLLLLLL)