[PATCH 4.9][AArch64] Backport r214953: Rename [u]int32x1_t to [u]int32_t (resp 16x1, 8x1)in arm_neon.h

Alan Lawrence alan.lawrence@arm.com
Fri Sep 5 14:28:00 GMT 2014

Some manual editing of patch required due to e.g. int64x1 changes present on 
trunk but not on the 4.9 branch; new patch attached.

I've done a quick smoke test of aarch64.exp+simd.exp (check-gcc) and the g++ 
neon ABI test, as these ought to catch any changes to Neon intrinsics; full 
testsuite running.

I repeat, this is source-code-compatibility breaking, but not ABI breaking; if 
it causes you any problems, it'll be the 4.9.x compiler shouting at you ;).

Ok assuming no regressions?


Marcus Shawcroft wrote:
> On 24 July 2014 11:18, Alan Lawrence <alan.lawrence@arm.com> wrote:
>> The ACLE spec does not mention the int32x1_t, uint32x1_t, int16x1_t,
>> uint16x1_t, int8x1_t or uint8x1_t types currently in arm_neon.h, but just
>> 'standard' types int32_t, int16_t, etc. This patch is a global
>> search-and-replace across arm_neon.h (and the tests that depend on it).
>> Regressed (check-gcc and check-g++) on aarch64-none-elf.
> OK for trunk.
>> The question of backporting to 4.9 has been raised internally. There is no
>> ABI issue, as int32x1_t was merely a typedef to int32_t (etc.). However
>> there is a source code compatibility issue; code mentioning the 32x1 types,
>> i.e. not conforming to the ACLE spec, which previously compiled, will no
>> longer do so. My personal feeling is therefore not to backport this, but I
>> would welcome input from maintainers (and others)...?
> I doubt that there is currently much code out there that will be
> affected by this change and that it would be better to back port and
> hence limit the amount of code written against the broken arm_neon.h
> during the life of the 4.9.x series. If there are no objections to
> back porting in the next couple of days then go ahead.
> /Marcus
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