Hi! On Sat, 17 Jul 2010, Mikael Pettersson wrote: > Included below is a test program which converts a set of large-magnitude > integers to double and back again, and prints their representations > and how much the final values differ from the original ones. I'd like > to ask someone with access to Alpha hardware to run this for me and > post the program's output. If cvtqt trapping to kernel is non-default > and requires a gcc option, I'd like the program to be compiled and > run twice, with and without that option. Please also verify that gcc > emits a cvtqt in the lltod() function (my gcc cross to alpha does so). Here's the output from an ES40 (EV68AL): 0x4000000000000000 -> 4.61169e+18 (0x43d0000000000000) -> 0x4000000000000000, diff 0 0x2000000000000000 -> 2.30584e+18 (0x43c0000000000000) -> 0x2000000000000000, diff 0 0x1000000000000000 -> 1.15292e+18 (0x43b0000000000000) -> 0x1000000000000000, diff 0 0x0800000000000000 -> 5.76461e+17 (0x43a0000000000000) -> 0x0800000000000000, diff 0 0x0400000000000000 -> 2.88230e+17 (0x4390000000000000) -> 0x0400000000000000, diff 0 0x0200000000000000 -> 1.44115e+17 (0x4380000000000000) -> 0x0200000000000000, diff 0 0x0100000000000000 -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff 0 0x0080000000000000 -> 3.60288e+16 (0x4360000000000000) -> 0x0080000000000000, diff 0 0x0040000000000000 -> 1.80144e+16 (0x4350000000000000) -> 0x0040000000000000, diff 0 0x0020000000000000 -> 9.00720e+15 (0x4340000000000000) -> 0x0020000000000000, diff 0 0x0010000000000000 -> 4.50360e+15 (0x4330000000000000) -> 0x0010000000000000, diff 0 0x0008000000000000 -> 2.25180e+15 (0x4320000000000000) -> 0x0008000000000000, diff 0 0x0004000000000000 -> 1.12590e+15 (0x4310000000000000) -> 0x0004000000000000, diff 0 0x0002000000000000 -> 5.62950e+14 (0x4300000000000000) -> 0x0002000000000000, diff 0 0x0001000000000000 -> 2.81475e+14 (0x42f0000000000000) -> 0x0001000000000000, diff 0 0x0100000000000010 -> 7.20576e+16 (0x4370000000000001) -> 0x0100000000000010, diff 0 0x0100000000000008 -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff -8 0x0100000000000004 -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff -4 0x0100000000000002 -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff -2 0x0100000000000001 -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff -1 0x0100000000000000 -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff 0 0x00ffffffffffffff -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff 1 0x00fffffffffffffe -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff 2 0x00fffffffffffffc -> 7.20576e+16 (0x4370000000000000) -> 0x0100000000000000, diff 4 0x00fffffffffffff8 -> 7.20576e+16 (0x436fffffffffffff) -> 0x00fffffffffffff8, diff 0 En/Disabling -mieee doesn't make a difference (as expected on this hardware). HTH, Tobias -- Sent from aboard the Culture ship ROU (Torturer Class) Nuisance Value -- To unsubscribe from this list: send the line "unsubscribe linux-alpha" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
