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- clean up assembly output slightly by only generating labels for the opcodes jumped to

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This commit is contained in:
Magnus Norddahl 2018-10-12 06:14:27 +02:00
parent c099b2d3c8
commit 44294a051a
3 changed files with 45 additions and 11 deletions
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25
src/scripting/vm/jit.cpp
View file

@ -148,13 +148,15 @@ void JitCompiler::Codegen()
cc.comment("", 0);
cc.comment(lineinfo.GetChars(), lineinfo.Len());
cc.bind(labels[i]);
labels[i].cursor = cc.getCursor();
ResetTemp();
EmitOpcode();
pc++;
}
BindLabels();
cc.endFunc();
cc.finalize();
}
@ -173,6 +175,22 @@ void JitCompiler::EmitOpcode()
}
}
void JitCompiler::BindLabels()
{
asmjit::CBNode *cursor = cc.getCursor();
unsigned int size = labels.Size();
for (unsigned int i = 0; i < size; i++)
{
const OpcodeLabel &label = labels[i];
if (label.inUse)
{
cc.setCursor(label.cursor);
cc.bind(label.label);
}
}
cc.setCursor(cursor);
}
void JitCompiler::Setup()
{
using namespace asmjit;
@ -245,10 +263,7 @@ void JitCompiler::Setup()
regA[i] = cc.newIntPtr(regname.GetChars());
}
int size = sfunc->CodeSize;
labels.Resize(size);
for (int i = 0; i < size; i++)
labels[i] = cc.newLabel();
labels.Resize(sfunc->CodeSize);
// VMCalls[0]++
auto vmcallsptr = newTempIntPtr();

8
src/scripting/vm/jit_flow.cpp
View file

@ -5,7 +5,7 @@ void JitCompiler::EmitTEST()
{
int i = (int)(ptrdiff_t)(pc - sfunc->Code);
cc.cmp(regD[A], BC);
cc.jne(labels[i + 2]);
cc.jne(GetLabel(i + 2));
}
void JitCompiler::EmitTESTN()
@ -13,14 +13,14 @@ void JitCompiler::EmitTESTN()
int bc = BC;
int i = (int)(ptrdiff_t)(pc - sfunc->Code);
cc.cmp(regD[A], -bc);
cc.jne(labels[i + 2]);
cc.jne(GetLabel(i + 2));
}
void JitCompiler::EmitJMP()
{
auto dest = pc + JMPOFS(pc) + 1;
int i = (int)(ptrdiff_t)(dest - sfunc->Code);
cc.jmp(labels[i]);
cc.jmp(GetLabel(i));
}
void JitCompiler::EmitIJMP()
@ -40,7 +40,7 @@ void JitCompiler::EmitIJMP()
int target = i + JMPOFS(&sfunc->Code[i]) + 1;
cc.cmp(val, i);
cc.je(labels[target]);
cc.je(GetLabel(target));
}
}

23
src/scripting/vm/jitintern.h
View file

@ -39,6 +39,7 @@ private:
#undef xx
void Setup();
void BindLabels();
void EmitOpcode();
void EmitPopFrame();
@ -63,7 +64,7 @@ private:
auto successLabel = cc.newLabel();
auto failLabel = labels[i + 2 + JMPOFS(pc + 1)];
auto failLabel = GetLabel(i + 2 + JMPOFS(pc + 1));
jmpFunc(static_cast<bool>(A & CMP_CHECK), failLabel, successLabel);
@ -172,7 +173,25 @@ private:
TArray<asmjit::X86Gp> regA;
TArray<asmjit::X86Gp> regS;
TArray<asmjit::Label> labels;
struct OpcodeLabel
{
asmjit::CBNode *cursor = nullptr;
asmjit::Label label;
bool inUse = false;
};
asmjit::Label GetLabel(size_t pos)
{
auto &label = labels[pos];
if (!label.inUse)
{
label.label = cc.newLabel();
label.inUse = true;
}
return label.label;
}
TArray<OpcodeLabel> labels;
const VMOP *pc;
VM_UBYTE op;