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Sema: Allow small integer types to coerce to floats

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If the float can store all possible values of the integer without
rounding, coercion is allowed. The integer's precision must be less than
or equal to the float's significand precision.

Closes #18614
This commit is contained in:
Jay Petacat
2026-01-08 23:48:25 -07:00
committed by Andrew Kelley
parent 5082e85de9
commit 484cc15366
6 changed files with 151 additions and 2 deletions
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test/cases/compile_errors/coerce_int_to_float.zig
+52
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// Test that integer types above a certain size will not coerce to a float.
fn testCoerce(Float: type, Int: type) void {
var i: Int = 0;
_ = &i;
_ = @as(Float, i);
}
export fn entry() void {
testCoerce(f16, u11); // Okay
testCoerce(f16, u12); // Too big
testCoerce(f16, i12);
testCoerce(f16, i13);
testCoerce(f32, u24);
testCoerce(f32, u25);
testCoerce(f32, i25);
testCoerce(f32, i26);
testCoerce(f64, u53);
testCoerce(f64, u54);
testCoerce(f64, i54);
testCoerce(f64, i55);
testCoerce(f80, u64);
testCoerce(f80, u65);
testCoerce(f80, i65);
testCoerce(f80, i66);
testCoerce(f128, u113);
testCoerce(f128, u114);
testCoerce(f128, i114);
testCoerce(f128, i115);
}
// error
//
// :6:20: error: expected type 'f16', found 'u12'
// :6:20: error: expected type 'f16', found 'i13'
// :6:20: error: expected type 'f32', found 'u25'
// :6:20: error: expected type 'f32', found 'i26'
// :6:20: error: expected type 'f64', found 'u54'
// :6:20: error: expected type 'f64', found 'i55'
// :6:20: error: expected type 'f80', found 'u65'
// :6:20: error: expected type 'f80', found 'i66'
// :6:20: error: expected type 'f128', found 'u114'
// :6:20: error: expected type 'f128', found 'i115'