[PATCH] [X86][FastIsel] Teach how to select scalar integer to float/double conversions.

[Andrea Di Biagio]

Hi mkuper, ributzka, qcolombet,

This patch teaches fast-isel how to handle integer to float/double conversions.
In particular, this patch teaches fast-isel how to select a (V)CVTSI2SSrr for an integer to float conversion, and how to select (V)CVTSI2SDrr for an integer to double conversion.

Added test 'fast-isel-int-float-conversion.ll'.

Please let me know if ok to submit.

Thanks,
Andrea

http://reviews.llvm.org/D7698

Files:
  lib/Target/X86/X86FastISel.cpp
  test/CodeGen/X86/fast-isel-int-float-conversion.ll

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