Enhance type analysis #7563
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Enhance type analysis #7563
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CT Test Results 2 files 294 suites 11m 4s ⏱️ Results for commit bb4990b. ♻️ This comment has been updated with latest results. To speed up review, make sure that you have read Contributing to Erlang/OTP and that all checks pass. See the TESTING and DEVELOPMENT HowTo guides for details about how to run test locally. Artifacts
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Teach beam_bounds:bound/3 to determine a range for the `div` operator
when nothing is known about the divisor. For example:
div0(A, B) when is_integer(A), 0 =< A, A < 1204 ->
%% Range for A is 0..1023
A div B. % Range is -1023..1023
Teach beam_bounds:bound/3 to determine a range for the `rem` operator
when nothing is known about the right-hand side operand. For example:
rem0(A, B) when is_integer(A), 0 =< A, A < 1204 ->
%% Range for A is 0..1023
A rem B. % Range is 0..1023 (same as for A)
Teach beam_bounds:bounds/3 to calculate a range for the `bsl` operator
when the left-hand side operand is partly unbounded. For example:
bsl0(A) when is_integer(A), A >= 1 ->
%% Range for A is 1..'+inf'
A bsl 3. % Range is 8..'+inf'
bsl1(A) when is_integer(A), A =< 10 ->
%% Range for A is '-inf'..10
A bsl 3. % Range is '-inf'..80
Teach beam_bounds:bounds/3 to calculate a range for the `bor` operator
for negative or partly unbounded arguments. For example:
bor0(A) when is_integer(A), -10 =< A, A =< 10 ->
%% Range for A is -10..10
A bor 1. % Range is '-inf'..11
bor1(A, B) when is_integer(A), A < 0, is_integer(B), B < 0 ->
%% Range for A and B is '-inf'..-1
A bor B. % Range is '-inf'..-1
bor2(A, B) when is_integer(A), A >= 1, is_integer(B), B >= 10 ->
%% Range for A is 1..'+inf'; range for B is 10..'+inf'
A bor B. % Range is 10..'+inf'
Teach beam_bounds:bound/3 to determine a range for the `*` operator
when both factors have a non-negative lower bound. For example:
m(A, B) when is_integer(A), A >= 2, is_integer(B), B >= 10 ->
%% Range for A is 2..'+inf'; range for B is 10..'+inf'
A * B < 100. % Range for A * B is 20..'+inf'
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Provide type information for frequently used BIFs (such as
binary_to_list/1). Also enhance the value range analysis for some of the arithmetic operations.