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Skip ImplWitnessTable::elements_id when generating fingerprints (#7629)

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Implementing interface modifiers causes an infinite loop when generating
fingerprints because the witness value generates a fingerprint that's
dependent on something dependent on the witness value. We've debugged
this to the witness table's `elements_id` field.

This hack is a workaround for creating a new block type whose value is
not codependent with its identity.

Co-authored-by: Richard Smith <richard@metafoo.co.uk>

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Christopher Di Bella
2026-08-11 22:39:30 +00:00
committed by GitHub
co-authored by Richard Smith
parent cb5e9b6555
commit 4ea5ef45dd
368 changed files with 11718 additions and 11723 deletions
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toolchain/driver/testdata/compile/optimize/optimize_debug.carbon
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+1 -1
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@@ -118,7 +118,7 @@ fn VectorizedWithOptSpeed(a: array(i32, 65536)*) {
// CHECK:STDOUT: !22 = !DILocation(line: 15, column: 9, scope: !16)
// CHECK:STDOUT: !23 = !DILocation(line: 16, column: 5, scope: !16)
// CHECK:STDOUT: !24 = !DILocation(line: 331, column: 3, scope: !25, inlinedAt: !32)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:AddAssignWith.6f9e8c1abf8bb3ea.Core:Int.9452f4c51951679b.Core:AddAssignWith.bcc2a64c00f3554f.Core.56c87c8744984bce", scope: null, file: !26, line: 331, type: !27, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !29)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:AddAssignWith.39e2e78a3c2e036d.Core:Int.9452f4c51951679b.Core:AddAssignWith.bcc2a64c00f3554f.Core.83481f1872d67895", scope: null, file: !26, line: 331, type: !27, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !29)
// CHECK:STDOUT: !26 = !DIFile(filename: "{{.*}}/prelude/types/int.carbon", directory: "")
// CHECK:STDOUT: !27 = !DISubroutineType(types: !28)
// CHECK:STDOUT: !28 = !{null, !7, !7}