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I'm going to be out of town for the weekend, so I'm not going to check this in this evening. But I plan to do so on Monday. That should leave the weekend for someone to beat on it some more. ;-) The patch has been tested: On i686 and alphaev56 with bootstrap, check, and Paranoia, all of which came out clean. That fairly well takes care of IEEE. Err, now that I think again, suppose I didn't check a 128-bit ieee target. A sparc64 run should verify that, which I'll start this evening. For VAX, I370, and C4X, I compared the output of float f[] = { 0.0f, -0.0f, 1.0f, -1.0f, 2.0f, 3.0f, 1.0f/3.0f, __FLT_MIN__, __FLT_MAX__, __FLT_DENORM_MIN__ }; double d[] = { 0.0, -0.0, 1.0, -1.0, 2.0, 3.0, 1.0/3.0, __DBL_MIN__, __DBL_MAX__, __DBL_DENORM_MIN__ }; long double l[] = { 0.0L, -0.0L, 1.0L, -1.0L, 2.0L, 3.0L, 1.0L/3.0L, __LDBL_MIN__, __LDBL_MAX__, __LDBL_DENORM_MIN__ }; against the old real.c implementation. VAX output is 100% identical. I370 output is identical except for DBL_MIN, which is now correct instead of zero. C4X output varies in its handling of -0 and DBL_MIN; I believe the old results to be in error, but it'd be nice if someone could confim that. (Oh, __FOO_DENORM_MIN__ comes from another patch I posted for libstdc++ last week. The failure of the old real.c to handle this value on x86 is what caused me to run down this bunny trail in the first place.) I include real.[ch] directly instead of via diffs, since it's about a third the size. r~
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