cmd/compile: const folding for float32/64
Split the auxFloat type into 32/64 bit versions and perform checking for exactly representable float32 values. Perform const folding on float32/64. Comment out some const negation rules that the frontend already performs. Change-Id: Ib3f8d59fa8b30e50fe0267786cfb3c50a06169d2 Reviewed-on: https://go-review.googlesource.com/20568 Run-TryBot: Todd Neal <todd@tneal.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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