[Bug target/15302] New: gcc not consistent for passing structures with complex in them
hjl at lucon dot org
gcc-bugzilla@gcc.gnu.org
Wed May 5 19:43:00 GMT 2004
According to ABI structures are classified based on 8bytes recrsively to
determine if they are passed in register or memory. The 2 examples below pass
similiar structures (according to ABI complex should be treated as struct with
2 floats) but gcc uses memory in one case (call to bar1) and registers in the
other case (call to foo1)
#include "complex.h"
struct st{
int s1;
float complex x;
int s2;
} st1;
bar()
{
bar1(st1);
}
/**********************
LCFI2:
movq st1(%rip), %rax
movq %rax, (%rsp)
movq st1+8(%rip), %rax
movq %rax, 8(%rsp)
movl $0, %eax
call bar1
**********************/
typedef struct { float r, i; } _complex;
struct stc{
int s1;
_complex x;
int s2;
}st2;
foo()
{
foo1(st2);
}
/**********************
.LCFI4:
movq st2(%rip), %rdi
movq st2+8(%rip), %rsi
movl $0, %eax
call foo1
**********************/
--
Summary: gcc not consistent for passing structures with complex
in them
Product: gcc
Version: 3.4.1
Status: UNCONFIRMED
Keywords: ABI
Severity: critical
Priority: P2
Component: target
AssignedTo: jh at suse dot cz
ReportedBy: hjl at lucon dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: x86_64-pc-linux-gnu
GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15302
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