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Support conversion between integer types. (#6856)

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Add an `IntFitsIn` interface with a custom witness, such that `T impls
IntFitsIn(U)` if `T` is an integer type all of whose values fit
losslessly into the integer type `U`. Use it to constrain implicit
conversions between integer types.

So far, this has not been extended to the
`CppCompat.[U]{Long32,LongLong64}` types, only to `Core.Int(N)` and
`Core.UInt(N)`.

Assisted-by: Gemini 3 Pro via Antigravity
This commit is contained in:
Richard Smith
2026-03-10 01:40:16 +00:00
committed by GitHub
parent 18cfeb7476
commit c297344937
27 changed files with 1281 additions and 349 deletions
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toolchain/check/testdata/interop/cpp/function/arithmetic_types_bridged.carbon
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@@ -786,8 +786,8 @@ fn F() {
// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.type.8ae: type = facet_type <@ImplicitAs, @ImplicitAs(%u8)> [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = symbolic_binding To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.6a6: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %To.fe9: Core.IntLiteral = symbolic_binding To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.6a6: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To.fe9) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.46e: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.6a6 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %ImplicitAs.impl_witness.7d6: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.899, @Core.IntLiteral.as.ImplicitAs.impl(%int_8) [concrete]