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improved handling of break statement

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- fix preservation of loop variables when breaking
- extend Yosys-compatible constant loop conversion to support loop
  variables declared outside of the looop
This commit is contained in:
Zachary Snow
2021-04-14 13:16:27 -04:00
parent 04d6fa6199
commit 44afcf5b29
3 changed files with 143 additions and 20 deletions
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test/basic/simple_loop_jump.sv
+42 -1
View File
@@ -8,8 +8,49 @@ module top;
f = f * 2;
end
endfunction
function automatic integer g;
input integer inp;
integer idx;
g = 1;
for (idx = 0; idx < inp; idx = idx + 1) begin
if (g == 32)
break;
g = g * 2;
end
g += idx;
endfunction
function automatic integer h;
input integer inp;
integer idx;
h = 1;
for (idx = 0; idx + 1 < 1 + inp; idx = idx + 1) begin
if (h == 32)
break;
h = h * 2;
end
h += idx + 1;
endfunction
function automatic integer j;
input integer inp;
for (j = 0; j < inp; j = j + 1)
if (j == 3)
return j;
j *= 2;
endfunction
function automatic integer k;
input integer inp;
for (k = 0; k + 1 < 1 + inp; k = k + 1)
if (k == 3)
return k * 3;
k = k * 2 + 1;
endfunction
integer i;
initial
for (i = 0; i < 10; i = i + 1)
for (i = 0; i < 10; i = i + 1) begin
$display("f(%0d) = %0d", i, f(i));
$display("g(%0d) = %0d", i, g(i));
$display("h(%0d) = %0d", i, h(i));
$display("j(%0d) = %0d", i, j(i));
$display("k(%0d) = %0d", i, k(i));
end
endmodule
test/basic/simple_loop_jump.v
+34 -1
View File
@@ -6,8 +6,41 @@ module top;
else
f = 2 ** inp;
endfunction
function automatic integer g;
input integer inp;
if (inp > 5)
g = 32 + 5;
else
g = 2 ** inp + inp;
endfunction
function automatic integer h;
input integer inp;
if (inp > 5)
h = 32 + 5 + 1;
else
h = 2 ** inp + inp + 1;
endfunction
function automatic integer j;
input integer inp;
if (inp > 3)
j = 3;
else
j = inp * 2;
endfunction
function automatic integer k;
input integer inp;
if (inp > 3)
k = 3 * 3;
else
k = inp * 2 + 1;
endfunction
integer i;
initial
for (i = 0; i < 10; i = i + 1)
for (i = 0; i < 10; i = i + 1) begin
$display("f(%0d) = %0d", i, f(i));
$display("g(%0d) = %0d", i, g(i));
$display("h(%0d) = %0d", i, h(i));
$display("j(%0d) = %0d", i, j(i));
$display("k(%0d) = %0d", i, k(i));
end
endmodule