GCC will not bootstrap after the expand from tuples checkin because the pointer
extension code is wrong. If you compile gcc.dg/20020517-1.c you can see the
problem. This test compiled and ran before but now core dumps. The difference
in the generated assembly code is:
< addp4 r14 = r12, r0
---
> addp4 r14 = 0,r12
Addp4 is the instruction IA64 uses to extend 32 bit pointers to 64 bits on IA64
HP-UX. It is not a symetrical instruction so the pointer must be the right
most operand, the other input is a register or constant offset to be added to
the pointer after it is extended. Before the change we generated "addp4 r14 =
0, r12" and that was good. But now we generate "addp4 r14 = r12, r0" and that
is wrong. IA64 uses the REG_POINTER macro to determine which input is a
pointer so that value must be wrong now.
--
Summary: bootstrap is broken after r151350 (expand from tuples)
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sje at cup dot hp dot com
GCC build triplet: ia64-hp-hpux11.23
GCC host triplet: ia64-hp-hpux11.23
GCC target triplet: ia64-hp-hpux11.23
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41268
