Thanks a lot for Wilco’s help on this bug.
Yes, Aarch64 does NOT do anything wrong.
The implementation of __builtin_update_setjmp_buf is not correct. It takes a
pointer
as an operand and treats the Mode of the pointer as Pmode, which is not correct.
a conversion from ptr_mode to Pmode is needed for this pointer.
bootstrapped on aarch64-unknown-linux-gnu.
testing on aarch64-unknown-linux-gnu is running.
the new patch is:
=====
gcc/ChangeLog
* builtins.c (expand_builtin_update_setjmp_buf): Add a
converstion to Pmode from the buf_addr.
gcc/testsuite/ChangeLog
PR middle-end/80295
* gcc.target/aarch64/pr80295.c: New test.
---
gcc/builtins.c | 1 +
gcc/testsuite/gcc.target/aarch64/pr80295.c | 8 ++++++++
2 files changed, 9 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/aarch64/pr80295.c
diff --git a/gcc/builtins.c b/gcc/builtins.c
index c8a5ea6..01fb08b 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -1199,6 +1199,7 @@ void
expand_builtin_update_setjmp_buf (rtx buf_addr)
{
machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
+ buf_addr = convert_memory_address (Pmode, buf_addr);
rtx stack_save
= gen_rtx_MEM (sa_mode,
memory_address
diff --git a/gcc/testsuite/gcc.target/aarch64/pr80295.c
b/gcc/testsuite/gcc.target/aarch64/pr80295.c
new file mode 100644
index 0000000..b3866d8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr80295.c
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-mabi=ilp32" } */
+
+void f (void *b)
+{
+ __builtin_update_setjmp_buf (b);
+}
+
--
1.9.1
>
>> On Oct 5, 2017, at 11:50 AM, Richard Earnshaw (lists)
>> <richard.earns...@arm.com> wrote:
>>
>> On 25/09/17 17:35, Qing Zhao wrote:
>>>
>>> --- a/gcc/config/aarch64/aarch64.h
>>> +++ b/gcc/config/aarch64/aarch64.h
>>> @@ -782,7 +782,7 @@ typedef struct
>>> /* Specify the machine mode that the hardware addresses have.
>>> After generation of rtl, the compiler makes no further distinction
>>> between pointers and any other objects of this machine mode. */
>>> -#define Pmode DImode
>>> +#define Pmode (TARGET_ILP32 ? SImode : DImode)
>>
>> This is wrong. AArch64 has both ptr_mode and Pmode. Pmode must always
>> be DImode as (internally) all addresses must be 64-bit. ptr_mode
>> reflects the ABI choice of 32/64-bit language level addresses. The
>> register SP must always be a 64-bit value, even when all the top 32 bits
>> are zero.
>
