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* reduce register pressure by allocating/deallocating registers as late/early as possible

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git-svn-id: trunk@24581 -
This commit is contained in:
florian 2013-05-24 18:09:15 +00:00
parent b734c17c4f
commit c1a1325a72
1 changed files with 4 additions and 4 deletions
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8
compiler/i8086/cgcpu.pas
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@ -997,13 +997,13 @@ unit cgcpu;
OS_S8: OS_S8:
begin begin
getcpuregister(list, NR_AX); getcpuregister(list, NR_AX);
getcpuregister(list, NR_DX);
add_mov(taicpu.op_reg_reg(A_MOV, S_B, reg1, NR_AL)); add_mov(taicpu.op_reg_reg(A_MOV, S_B, reg1, NR_AL));
getcpuregister(list, NR_DX);
list.concat(taicpu.op_none(A_CBW)); list.concat(taicpu.op_none(A_CBW));
list.concat(taicpu.op_none(A_CWD)); list.concat(taicpu.op_none(A_CWD));
add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_AX, reg2)); add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_AX, reg2));
add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_DX, GetNextReg(reg2)));
ungetcpuregister(list, NR_AX); ungetcpuregister(list, NR_AX);
add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_DX, GetNextReg(reg2)));
ungetcpuregister(list, NR_DX); ungetcpuregister(list, NR_DX);
end; end;
OS_16: OS_16:
@ -1014,12 +1014,12 @@ unit cgcpu;
OS_S16: OS_S16:
begin begin
getcpuregister(list, NR_AX); getcpuregister(list, NR_AX);
getcpuregister(list, NR_DX);
add_mov(taicpu.op_reg_reg(A_MOV, S_W, reg1, NR_AX)); add_mov(taicpu.op_reg_reg(A_MOV, S_W, reg1, NR_AX));
getcpuregister(list, NR_DX);
list.concat(taicpu.op_none(A_CWD)); list.concat(taicpu.op_none(A_CWD));
add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_AX, reg2)); add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_AX, reg2));
add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_DX, GetNextReg(reg2)));
ungetcpuregister(list, NR_AX); ungetcpuregister(list, NR_AX);
add_mov(taicpu.op_reg_reg(A_MOV, S_W, NR_DX, GetNextReg(reg2)));
ungetcpuregister(list, NR_DX); ungetcpuregister(list, NR_DX);
end; end;
OS_32,OS_S32: OS_32,OS_S32: