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Don't verify exact NaN text for .debugDescription (#33391)

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This specific check has never worked on all processors (because
some FP HW mangles NaNs) and recent LLVM changes have broken
it on the remaining platforms.

Resolves SR-13354
This commit is contained in:
tbkka
2020-08-10 18:40:57 -07:00
committed by GitHub
parent 142aa5f999
commit 7de957362e
1 changed files with 9 additions and 10 deletions
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19
test/stdlib/PrintFloat.swift.gyb
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@@ -442,21 +442,20 @@ fileprivate func expectNaN<T>(_ expected: String, _ object: T,
message(),
stackTrace: stackTrace.pushIf(showFrame, file: file, line: line))
// debugDescription prints full details about NaNs, which is tricky to test
// because NaNs often get truncated: various implementations force all NaNs
// quiet, discard payloads, or clear sign bits. In some cases, just passing a
// NaN into a function (via an FP register) is enough to mangle the value.
// debugDescription tries to print details about NaNs, which is tricky to test.
#if arch(x86_64)
// Verify the exact debugDescription value only on x86_64, where we
// know the exact expected String:
/*
// We cannot reliably test the exact expected string, because various
// implementations force all NaNs quiet, discard payloads, or clear sign bits.
// In some cases, just passing a NaN into a function (via an FP register) is
// enough to mangle the value.
expectEqual(expected, object.debugDescription,
message(),
stackTrace: stackTrace.pushIf(showFrame, file: file, line: line))
#endif
*/
// On all platforms, we verify that the generated debugDescription text
// follows the expected format, even when we can't verify the exact value.
// We can verify that the generated debugDescription text
// follows the expected general format, even when we can't verify the exact value.
var actual = object.debugDescription
// Optional leading "-"