------- Comment #6 from danglin at gcc dot gnu dot org 2008-12-27 17:33 -------
I agree with Steve that this is a HP math lib bug. For Steve's test
program, we have the following code at -O1:
fldw 0(%r3),%fr12R
fcpy,sgl %fr12R,%fr4R
fcpy,sgl %fr13R,%fr5R
ldo -48(%r30),%r29
b,l powf,%r2
copy %r27,%r4
copy %r4,%r27
fstw %fr4R,-1176(%r30)
fdiv,sgl %fr14R,%fr12R,%fr12R
fmpy,sgl %fr12R,%fr12R,%fr12R
fstw %fr12R,-1172(%r30)
ldo -1176(%r30),%r26
ldo -48(%r30),%r29
b,l check_equal_r_,%r2
ldo -1172(%r30),%r25
Checking the value of fr12R before and after the call to powf, I see the values
differ. The runtime specification states on page 14 that FRs 12-21 are
preserved across calls.
I think this bug can be worked around by providing powf in libgfortran on this
target.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31832
