Hi,
I finally got around to checking the attached patch for the
https://bugs.launchpad.net/ubuntu/+source/gcc-4.8/+bug/1270789
I noticed attached patch causes regression for pr38151.c in gcc test-suite.
A reduced test-case that triggers this is:
static unsigned long global_max_fast;
int __libc_mallopt (int param_number, int value)
{
__asm__ __volatile__ ("# %[_SDT_A2]" :: [_SDT_A2] "nor"
((global_max_fast)));
global_max_fast = 1;
}
In this regard I have couple of questions:
1. Is the in-line asm valid? Look ok to me.
2. For the pr38151.c regression, asm diff is as shown below.
< add x0, x0, :lo12:.LANCHOR0
< ldr x0, [x0]
---
> ldr x0, [x0,#:lo12:.LANCHOR0]
This causes:
pr38151.c:(.text+0x10c): relocation truncated to fit:
R_AARCH64_LDST64_ABS_LO12_NC against `.rodata'
collect2: error: ld returned 1 exit status.
If I however increase the alignment of .rodata where .LANCHOR0 is
defined, this passes. Is alignment of BITS_PER_UNIT valid for
SYMBOL_REF? If I change it as I am doing this attached patch, is there
anything else I need to do.
Thanks,
Kugan
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 57b6645..3d15d54 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -3193,6 +3193,8 @@ aarch64_classify_address (struct aarch64_address_info
*info,
}
else if (SYMBOL_REF_DECL (sym))
align = DECL_ALIGN (SYMBOL_REF_DECL (sym));
+ else if (GET_CODE(sym) == SYMBOL_REF)
+ align = GET_MODE_ALIGNMENT (GET_MODE (sym));
else
align = BITS_PER_UNIT;
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