Add some more reserve calls to RTLIL::Const

This results in a slight ~0.22% total speedup synthesizing vexriscv

diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index a89edd992644effb397d68d086e4e096b26f7f0f..72dcb89af22e51fae7f61229a34270373689b730 100644 (file)
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -207,6 +207,7 @@ RTLIL::Const::Const()
 RTLIL::Const::Const(std::string str)
 {
        flags = RTLIL::CONST_FLAG_STRING;
+       bits.reserve(str.size() * 8);
        for (int i = str.size()-1; i >= 0; i--) {
                unsigned char ch = str[i];
                for (int j = 0; j < 8; j++) {
@@ -219,6 +220,7 @@ RTLIL::Const::Const(std::string str)
 RTLIL::Const::Const(int val, int width)
 {
        flags = RTLIL::CONST_FLAG_NONE;
+       bits.reserve(width);
        for (int i = 0; i < width; i++) {
                bits.push_back((val & 1) != 0 ? State::S1 : State::S0);
                val = val >> 1;
@@ -228,6 +230,7 @@ RTLIL::Const::Const(int val, int width)
 RTLIL::Const::Const(RTLIL::State bit, int width)
 {
        flags = RTLIL::CONST_FLAG_NONE;
+       bits.reserve(width);
        for (int i = 0; i < width; i++)
                bits.push_back(bit);
 }
@@ -235,6 +238,7 @@ RTLIL::Const::Const(RTLIL::State bit, int width)
 RTLIL::Const::Const(const std::vector<bool> &bits)
 {
        flags = RTLIL::CONST_FLAG_NONE;
+       this->bits.reserve(bits.size());
        for (const auto &b : bits)
                this->bits.emplace_back(b ? State::S1 : State::S0);
 }
@@ -242,6 +246,7 @@ RTLIL::Const::Const(const std::vector<bool> &bits)
 RTLIL::Const::Const(const RTLIL::Const &c)
 {
        flags = c.flags;
+       this->bits.reserve(c.size());
        for (const auto &b : c.bits)
                this->bits.push_back(b);
 }