1f4f2d0d39
Adds the FCFIDU instruction and uses it instead of the FCFID instruction for unsigned integer to float casts. This change means that unsigned integers do not have to be cast to signed integers before being cast to a floating point value. Therefore it is no longer necessary to insert instructions to detect and fix values that overflow int64. The previous code generating the uint64 to int64 cast handled overflow by truncating the uint64 value. This truncation can change the result of the rounding performed by the integer to float cast. The FCFIDU instruction was added in Power ISA 2.06B. Fixes #15539. Change-Id: Ia37a9631293eff91032d4cd9a9bec759d2142437 Reviewed-on: https://go-review.googlesource.com/22772 Reviewed-by: David Chase <drchase@google.com> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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