Hi,
It seems that on hppa, it's is caused by delayed branch. It
seems to do an add and substract with -fdelayed-brach, which it
doesn't with -fno-delayed-branch.
Applying following diff of the assembler file generated with -O2 (and
-fdelayed-brach) fixes it:
--- pp_pack.s 2006-08-06 05:50:18.000000000 -0600
+++ pp_pack.s 2006-08-06 08:59:01.000000000 -0600
@@ -4474,13 +4474,11 @@
fdiv,dbl %fr13,%fr5,%fr5
.L1296:
fldds 8(%r3),%fr22
- fadd,dbl %fr13,%fr22,%fr13
.L1447:
+ fadd,dbl %fr13,%fr22,%fr13
fcmp,dbl,!< %fr13,%fr0
ftest
- b .L1447
- fadd,dbl %fr13,%fr22,%fr13
- fsub,dbl %fr13,%fr22,%fr13
+ b,n .L1447
fldds 8(%r3),%fr5
fdiv,dbl %fr13,%fr5,%fr5
.L1463:
--
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