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NetBSD/lib/libc/softfloat/README.NetBSD

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Import the 32-bit version of SoftFloat 2a and separate it and the 64-bit version into different directories. Which version a given port uses is controlled by the SOFTFLOAT_BITS make variable. This is set to 64 (which uses the same code we had before) by default. 32-bit platforms that don't need extended precision support might get better performance by using 32. Set the ARM port to use the 32-bit version of SoftFloat, since this is more than a factor of two faster than the 64-bit version. This should get the floating-point performance back to what it was in 1.5.
2002-05-22 03:51:04 +04:00
$NetBSD: README.NetBSD,v 1.2 2002/05/21 23:51:05 bjh21 Exp $
Initial commit of SoftFloat 2a import. This should provide a sensible mostly-MI floating-point implementation for use by gcc -msoft-float. It's currently only used by arm26, but should be usable by other ports without too much hacking, assuming doubles and u_int64_ts are passed and returned the same way, and FP formats are IEEEish.
2000-06-06 12:14:49 +04:00
Import the 32-bit version of SoftFloat 2a and separate it and the 64-bit version into different directories. Which version a given port uses is controlled by the SOFTFLOAT_BITS make variable. This is set to 64 (which uses the same code we had before) by default. 32-bit platforms that don't need extended precision support might get better performance by using 32. Set the ARM port to use the 32-bit version of SoftFloat, since this is more than a factor of two faster than the 64-bit version. This should get the floating-point performance back to what it was in 1.5.
2002-05-22 03:51:04 +04:00
This is a modified version of part of John Hauser's SoftFloat 2a package.
This version has been heavily modified to support its use with GCC to
Initial commit of SoftFloat 2a import. This should provide a sensible mostly-MI floating-point implementation for use by gcc -msoft-float. It's currently only used by arm26, but should be usable by other ports without too much hacking, assuming doubles and u_int64_ts are passed and returned the same way, and FP formats are IEEEish.
2000-06-06 12:14:49 +04:00
implement built-in floating-point operations, but compiling
softfloat.c without SOFTFLOAT_FOR_GCC defined should get you the same
results as from the original.