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Author SHA1 Message Date
Sanjay Patel 149f5b573c [APFloat] convert SNaN to QNaN in convert() and raise Invalid signal 
This is an alternate fix (see D87835) for a bug where a NaN constant
gets wrongly transformed into Infinity via truncation.
In this patch, we uniformly convert any SNaN to QNaN while raising
'invalid op'.
But we don't have a way to directly specify a 32-bit SNaN value in LLVM IR,
so those are always encoded/decoded by calling convert from/to 64-bit hex.

See D88664 for a clang fix needed to allow this change.

Differential Revision: https://reviews.llvm.org/D88238
 2020-10-01 14:37:38 -04:00
Sanjay Patel 81921ebc43 [CodeGen] improve coverage for float (32-bit) type of NAN; NFC 
Goes with D88238
 2020-09-30 15:10:25 -04:00
Sanjay Patel 187686bea3 [CodeGen] add test for NAN creation; NFC 
This goes with the APFloat change proposed in
D88238.
This is copied from the MIPS-specific test in
builtin-nan-legacy.c to verify that the normal
behavior is correct on other targets without the
complication of an inverted quiet bit.
 2020-09-30 13:22:12 -04:00