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vchip8
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All ALU tests pass

master
q3k 2014-01-04 14:07:57 +01:00
parent c1fd5a6c12
commit 5b1aee887b
4 changed files with 24 additions and 3 deletions
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1
.gitignore vendored
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@ -1 +1,2 @@
*.swp
obj_dir

2
Makefile
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@ -1,7 +1,7 @@
obj_dir/Vcpu.cpp: cpu.v test_main.cpp
verilator -Wall -cc cpu.v --exe test_main.cpp
obj_dir/Vcpu: obj_dir/Vcpu.cpp
obj_dir/Vcpu: obj_dir/Vcpu.cpp test_main.cpp
cd obj_dir; make -j -f Vcpu.mk Vcpu
test: obj_dir/Vcpu

7
cpu.v
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@ -187,8 +187,11 @@ module cpu (
vr[15] <= {7'b0, vr[x][0]};
vr[x] <= vr[x] >> 1;
end
7: { vr[15], vr[x] } <= ({8'b0, vr[y]} - {8'b0, vr[x]}) ^ (1 << 8);
15: begin
7: begin
vr[x] <= vr[y] - vr[x];
vr[15] <= {7'b0, vr[y] >= vr[x]};
end
14: begin
vr[15] <= {7'b0, vr[x][7]};
vr[x] <= vr[x] << 1;
end

17
test_main.cpp
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@ -99,4 +99,21 @@ int main(int argc, char **argv)
test_alu_instruction_vf(0x45, 0x45, 0x8125, 0x00, 0x01);
printf("SUB (borrow) ");
test_alu_instruction_vf(0x15, 0x45, 0x8125, 0xD0, 0x00);
// SHR
printf("SHR (one) ");
test_alu_instruction_vf(0x45, 0x00, 0x8126, 0x45>>1, 0x01);
printf("SHR (zero) ");
test_alu_instruction_vf(0x44, 0x00, 0x8126, 0x44>>1, 0x00);
// SUBN
printf("SUBN (no borrow) ");
test_alu_instruction_vf(0x15, 0x45, 0x8127, 0x30, 0x01);
printf("SUBN (zero, no borrow) ");
test_alu_instruction_vf(0x45, 0x45, 0x8127, 0x00, 0x01);
printf("SUBN (borrow) ");
test_alu_instruction_vf(0x45, 0x15, 0x8127, 0xD0, 0x00);
// SHL
printf("SHL (one) ");
test_alu_instruction_vf(0xA4, 0x00, 0x812E, (0xA4<<1)&0xFF, 0x01);
printf("SHL (zero) ");
test_alu_instruction_vf(0x24, 0x00, 0x812E, (0x24<<1)&0xFF, 0x00);
}