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[Re: [patch] Add NetBSD/hppa target]
Hi folks, we never upstreamed the GCC target, and now with the new QEMU
support, I thought it's a good time to do it.
A discussion came up on ABI choices on gcc-patches:
----- Forwarded message from John David Anglin <dave.anglin%bell.net@localhost> -----
On 2019-06-14 12:02 p.m., Jeff Law wrote:
>> diff --git a/gcc/config.gcc b/gcc/config.gcc
>> index 76bb316942d..ba93bb41ec8 100644
>> --- a/gcc/config.gcc
>> +++ b/gcc/config.gcc
>> @@ -1481,6 +1481,14 @@ hppa*-*-openbsd*)
>> + target_cpu_default="MASK_PA_11|MASK_NO_SPACE_REGS"
> Any reason to not use the PA 2.0 ISA? I'm virtually certain we
> supported the 32bit ABI running on PA 2.0 hardware in hpbsd (which is
> where the netbsd PA code is ultimately derived from). I'd be really
> surprised if there's any PA1.1 hardware running anywhere, though there's
> certainly some PA2.0 hardware out in the wild.
You might also consider adding MASK_CALLER_COPIES as libgomp is broken for callee
copies. This is an ABI choice so ideally you should do it now or not at all.
----- End forwarded message -----
From GCC's sources:
Generate code that assumes the target has no space registers. This
allows GCC to generate faster indirect calls and use unscaled index
Such code is suitable for level 0 PA systems and kernels.
/* Implement TARGET_CALLEE_COPIES. The callee is responsible for copying
arguments passed by hidden reference in the 32-bit HP runtime. Users
can override this behavior for better compatibility with openmp at the
risk of library incompatibilities. Arguments are always passed by value
in the 64-bit HP runtime. */
These could introduce binary compatibility problems, but it's not my
call to make.
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