Reduce register spilling on function entry/exit

autotest/asmtest.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <assert.h>
 
 int asum(int a, int b)
 {
@@ -30,11 +31,46 @@ int bsum(int a, int b)
 	}
 }
 
+int b, t[10];
+
+int bsome(int x)
+{
+	return x;
+}
+
+
+int qsum(int a, int (* c)(int))
+{
+	char n = 0;
+	b = 0;
+	for(int i=0; i<a; i++)
+	{
+		int j = c((char)i);
+		__asm
+		{
+			clc
+			lda	j
+			adc b
+			sta b
+			lda j + 1
+			adc b + 1
+			sta b + 1
+		}
+		t[n] += i;
+		n = (n + 1) & 7;
+	}
+	return b;
+}
+
 int main(void)
 {
 	int	x = asum(7007, 8008);
 	int	y = bsum(4004, 9009);
 
-	return (x == 7007 + 8008 && y == 4004 + 9009) ? 0 : -1;
+	assert(x == 7007 + 8008 && y == 4004 + 9009);
+	assert(qsum(10, bsome) == 45);
+	assert(qsum(200, bsome) == 19900);
+
+	return 0;
 }
 

oscar64/Compiler.cpp

@@ -180,6 +180,7 @@ bool Compiler::GenerateCode(void)
 	mGlobalAnalyzer->DumpCallGraph();
 
 	mInterCodeGenerator->mCompilerOptions = mCompilerOptions;
+	mNativeCodeGenerator->mCompilerOptions = mCompilerOptions;
 
 	mInterCodeGenerator->TranslateAssembler(mInterCodeModule, dcrtstart->mValue, nullptr);
 

oscar64/InterCodeGenerator.cpp

@@ -2334,6 +2334,13 @@ InterCodeGenerator::ExValue InterCodeGenerator::TranslateExpression(Declaration*
 						vins->mConst.mOperandSize = vdec->mSize;
 						vins->mConst.mIntConst = vdec->mOffset;
 					}
+					else if (vdec->mType == DT_VARIABLE)
+					{
+						vins->mConst.mMemory = IM_LOCAL;
+						vins->mConst.mVarIndex = vdec->mVarIndex;
+						vins->mConst.mOperandSize = vdec->mSize;
+						vins->mConst.mIntConst = vdec->mOffset;
+					}
 
 					block->Append(vins);