http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54457
Bug #: 54457
Summary: [x32] Fail to combine 64bit index + constant
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
[hjl@gnu-ivb-1 pr54445]$ cat z.i
extern char array[40];
char
foo (long long int position) {
return array[position + 1];
}
[hjl@gnu-ivb-1 pr54445]$
/export/build/gnu/gcc-x32/build-x86_64-linux/prev-gcc/xgcc
-B/export/build/gnu/gcc-x32/build-x86_64-linux/prev-gcc/ -Wall -O2 -std=gnu11
-mx32 -S z.i -da
[hjl@gnu-ivb-1 pr54445]$ cat z.s
.file "z.i"
.text
.p2align 4,,15
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
addq $1, %rdi
movzbl array(%edi), %eax
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.ident "GCC: (GNU) 4.8.0 20120901 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-ivb-1 pr54445]$
combine fails on:
Trying 6 -> 8:
Failed to match this instruction:
(set (reg:QI 66)
(mem/j:QI (plus:SI (subreg:SI (plus:DI (reg/v:DI 62 [ position ])
(const_int 1 [0x1])) 0)
(symbol_ref:SI ("array") [flags 0x40] <var_decl 0x7ffff19ad260
arra
y>)) [0 array S1 A8]))
This should be a valid address.
