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#include <catch/catch.hpp>
#include <array>
#include <biscuit/assembler.hpp>
#include "assembler_test_utils.hpp"
using namespace biscuit;
TEST_CASE("Branch to Self", "[branch]") {
uint32_t data;
auto as = MakeAssembler32(data);
// Simple branch to self with a jump instruction.
{
Label label;
as.Bind(&label);
as.J(&label);
REQUIRE(data == 0x0000006F);
}
as.RewindBuffer();
// Simple branch to self with a compressed jump instruction.
{
Label label;
as.Bind(&label);
as.C_J(&label);
REQUIRE((data & 0xFFFF) == 0xA001);
}
as.RewindBuffer();
// Simple branch to self with a conditional branch instruction.
{
Label label;
as.Bind(&label);
as.BNE(x3, x4, &label);
REQUIRE(data == 0x00419063);
}
as.RewindBuffer();
// Simple branch to self with a compressed branch instruction.
{
Label label;
as.Bind(&label);
as.C_BNEZ(x15, &label);
REQUIRE((data & 0xFFFF) == 0xE381);
}
}
TEST_CASE("Branch with Instructions Between", "[branch]") {
std::array<uint32_t, 20> data{};
auto as = MakeAssembler32(data);
// Simple branch backward
{
Label label;
as.Bind(&label);
as.ADD(x1, x2, x3);
as.SUB(x2, x4, x3);
as.J(&label);
REQUIRE(data[2] == 0xFF9FF06F);
}
as.RewindBuffer();
data.fill(0);
// Simple branch forward
{
Label label;
as.J(&label);
as.ADD(x1, x2, x3);
as.SUB(x2, x4, x3);
as.Bind(&label);
REQUIRE(data[0] == 0x00C0006F);
}
as.RewindBuffer();
data.fill(0);
// Simple branch backward (compressed)
{
Label label;
as.Bind(&label);
as.ADD(x1, x2, x3);
as.SUB(x2, x4, x3);
as.C_J(&label);
REQUIRE((data[2] & 0xFFFF) == 0xBFC5);
}
as.RewindBuffer();
data.fill(0);
// Simple branch forward (compressed)
{
Label label;
as.C_J(&label);
as.ADD(x1, x2, x3);
as.SUB(x2, x4, x3);
as.Bind(&label);
REQUIRE((data[0] & 0xFFFF) == 0xA0A1);
}
}
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