extern int foo (float _Complex);
int
main ()
{
float _Complex z;
__real__ z = 0.0;
__imag__ z = -1.0;
return foo (z);
}
gcc -S -O2 complex.c
.LEVEL 1.1
.section .rodata.cst4,"aM",@progbits,4
.align 4
.LC0:
.word -1082130432
.text
.align 4
.globl main
.type main, @function
main:
.PROC
.CALLINFO FRAME=64,CALLS,SAVE_RP
.ENTRY
stw %r2,-20(%r30)
ldo 64(%r30),%r30
ldw -84(%r30),%r2
fcpy,sgl %fr0,%fr5L
ldil LR'.LC0,%r19
ldo RR'.LC0(%r19),%r19
fldws 0(%r19),%fr5R
bl foo,%r0
ldo -64(%r30),%r30
nop
.PROCEND
.size main, .-main
.ident "GCC: (GNU) 3.3.4"
The complex value is being passed in fr5L and fr5R. Although there is no
definitive guidelines in the HP runtime documentation regarding how complex
values should be passed on the PA-RISC architecture, my contacts at HP
indicate complex values should be treated as aggregates and therefore should
be passed in the general registers for float _Complex in the 32-bit runtime.
double and long double _Complex should be passed by reference since aggregates
larger than 64-bits are passed by reference.
In the 64-bit runtime, they should be passed in the same manner as aggregates
(i.e., in the general registers). There is a mention of homogenous floating
point aggregates in the 64-bit runtime documentation but, unlike ia64, this was
not implemented in HP PA64 compilers.
--
Summary: Complex values passed in wrong registers
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: danglin at gcc dot gnu dot org
GCC build triplet: hppa*-*-*
GCC host triplet: hppa*-*-*
GCC target triplet: hppa*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25731
