Find limit of recursion: Difference between revisions
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m (→{{header|Zig}}: Add third example where compiler automatically decides to do (or not to do) STRE (like it works with many other languages here)) |
m (→{{header|Zig}}: Note for 0.10.x versions) |
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{{Trans|C}} |
{{Trans|C}} |
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'''Works with:''' 0.11.x, 0.12.0-dev.1381+61861ef39 |
'''Works with:''' 0.11.x, 0.12.0-dev.1381+61861ef39 |
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For 0.10.x, replace @call(.some_call_modifier, ...) with @call(.{ .modifier = .some_call_modifier }, ...) in these examples. |
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In this version, Zig compiler is free to (not) optimize recursive function, so behaviour may change from one optimization mode to another, like it was with 2-nd example from C section. |
In this version, Zig compiler is free to (not) optimize recursive function, so behaviour may change from one optimization mode to another, like it was with 2-nd example from C section. |
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<syntaxhighlight lang="zig">const std = @import("std"); |
<syntaxhighlight lang="zig">const std = @import("std"); |
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===Force-disable TRE=== |
===Force-disable TRE=== |
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'''Works with:''' 0.11.x, 0.12.0-dev.1381+61861ef39 |
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To force-disable "simple tail recursion elimination" (STRE) for all optimize modes, we can use "never_tail" field of enum "std.builtin.CallModifier". It works not as hint, but as a hard requirement, so if it's impossible to fulfill, compile error is outputted. |
To force-disable "simple tail recursion elimination" (STRE) for all optimize modes, we can use "never_tail" field of enum "std.builtin.CallModifier". It works not as hint, but as a hard requirement, so if it's impossible to fulfill, compile error is outputted. |
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<syntaxhighlight lang="zig">const std = @import("std"); |
<syntaxhighlight lang="zig">const std = @import("std"); |
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===Force-enable TRE=== |
===Force-enable TRE=== |
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'''Works with:''' 0.11.x, 0.12.0-dev.1381+61861ef39 |
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Similarly, we can force-enable mentioned optimization in all optimize modes by using enum field "always_tail". It's (again) a hard requirement and will emit compile error if this requirement is impossible to complete. |
Similarly, we can force-enable mentioned optimization in all optimize modes by using enum field "always_tail". It's (again) a hard requirement and will emit compile error if this requirement is impossible to complete. |
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<syntaxhighlight lang="zig">const std = @import("std"); |
<syntaxhighlight lang="zig">const std = @import("std"); |
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