results at
<http://buildd.debian.org/fetch.cgi?&pkg=ilmbase&ver=1.0.1-2&arch=m68k&stamp=1208985766&file=log>
Thanks - that gets a lot farther along. Different gcc and binutils,
though.
Want me to try it with the same versions on aranym?
That's probably not worth it. Do you stil have the build tree?
objdump on testBitPatterns.o gives:
0000005c
<_ZN63_GLOBAL__N_.._.._HalfTest_testBitPatterns.cpp_00000000_2E91A93413floatPosQNan1Ev>:
5c: 4e56 0000 linkw %fp,#0
60: f23c 4400 7fff fmoves #nan,%fp0
66: ffff
68: 4e5e unlk %fp
6a: 4e75 rts
0000006c
<_ZN63_GLOBAL__N_.._.._HalfTest_testBitPatterns.cpp_00000000_2E91A93413floatNegQNan1Ev>:
6c: 4e56 0000 linkw %fp,#0
70: f23c 4400 7fff fmoves #nan,%fp0
76: ffff
78: 4e5e unlk %fp
7a: 4e75 rts
0000007c
<_ZN63_GLOBAL__N_.._.._HalfTest_testBitPatterns.cpp_00000000_2E91A93413floatPosQNan2Ev>:
7c: 4e56 0000 linkw %fp,#0
80: f23c 4400 7fff fmoves #nan,%fp0
86: ffff
88: 4e5e unlk %fp
8a: 4e75 rts
0000008c
<_ZN63_GLOBAL__N_.._.._HalfTest_testBitPatterns.cpp_00000000_2E91A93413floatNegQNan2Ev>:
8c: 4e56 0000 linkw %fp,#0
90: f23c 4400 7fff fmoves #nan,%fp0
96: ffff
98: 4e5e unlk %fp
9a: 4e75 rts
IOW, either binutils or cpp ignore the bit pattern bunged in the
respective union, and replace it with a positive NaN straight away.
I'd like to see how that piece of code looks like when buils with other
versions of gcc and/or cpp. gcc-4.3_4.3.0-3 g++-4.3_ binutils_2.18.1~cv
s20080103-1 is what I used.
I'll play with the respectice code some more, including trying -O1 or -O0.
Other ideas, anyone?
Cheers,
Michael
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