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[SystemZ][FPEnv] Back-end support for STRICT_[SU]INT_TO_FP

Authored by uweigand on Dec 17 2019, 9:20 AM.

Description

[SystemZ][FPEnv] Back-end support for STRICT_[SU]INT_TO_FP

As of b1d8576 there is middle-end support for STRICT_[SU]INT_TO_FP,
so this patch adds SystemZ back-end support as well.

The patch is SystemZ target specific except for adding SD patterns
strict_[su]int_to_fp and any_[su]int_to_fp to TargetSelectionDAG.td
as usual.

Details