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X87: [builtins] Migrate Math.log to TurboFan.

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port f2da19fe39 (r36703)

  original commit message:
  Introduce a dedicated Float64Log machine operator, that is either
  implemented by a direct C call or by platform specific code, i.e.
  using the FPU on x64 and ia32.

  This operator is used to implement Math.log as a proper TurboFan
  builtin on top of the CodeStubAssembler.

  Also introduce a NumberLog simplified operator on top of Float64Log
  and use that for the fast inline path of Math.log inside TurboFan
  optimized code.

BUG=

Review-Url: https://codereview.chromium.org/2034393002
Cr-Commit-Position: refs/heads/master@{#36727}
This commit is contained in:
zhengxing.li 2016-06-05 19:58:47 -07:00 committed by Commit bot
parent ecd4086cf0
commit 973823e454
3 changed files with 18 additions and 0 deletions
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12
src/compiler/x87/code-generator-x87.cc
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@ -898,6 +898,18 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
case kX87Popcnt:
__ Popcnt(i.OutputRegister(), i.InputOperand(0));
break;
case kX87Float64Log:
if (FLAG_debug_code && FLAG_enable_slow_asserts) {
__ VerifyX87StackDepth(1);
}
__ X87SetFPUCW(0x027F);
__ fstp(0);
__ fldln2();
__ fld_d(MemOperand(esp, 0));
__ fyl2x();
__ lea(esp, Operand(esp, kDoubleSize));
__ X87SetFPUCW(0x037F);
break;
case kX87LoadFloat64Constant: {
InstructionOperand* source = instr->InputAt(0);
InstructionOperand* destination = instr->Output();

1
src/compiler/x87/instruction-codes-x87.h
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@ -44,6 +44,7 @@ namespace compiler {
V(X87Ror) \
V(X87Lzcnt) \
V(X87Popcnt) \
V(X87Float64Log) \
V(X87Float32Cmp) \
V(X87Float32Add) \
V(X87Float32Sub) \

5
src/compiler/x87/instruction-selector-x87.cc
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@ -1009,6 +1009,11 @@ void InstructionSelector::VisitFloat64Abs(Node* node) {
Emit(kX87Float64Abs, g.DefineAsFixed(node, stX_0), 0, nullptr);
}
void InstructionSelector::VisitFloat64Log(Node* node) {
X87OperandGenerator g(this);
Emit(kX87PushFloat64, g.NoOutput(), g.Use(node->InputAt(0)));
Emit(kX87Float64Log, g.DefineAsFixed(node, stX_0), 0, nullptr);
}
void InstructionSelector::VisitFloat32Sqrt(Node* node) {
X87OperandGenerator g(this);