[LLVMbugs] [Bug 17718] New: ARM and AArch64 NEON VLD/VST have warnings about type float16_t/poly8_t/poly16_t pointers

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17718

            Bug ID: 17718
           Summary: ARM and AArch64 NEON VLD/VST have warnings about type
                    float16_t/poly8_t/poly16_t pointers
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Hao.Liu at arm.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11436
  --> http://llvm.org/bugs/attachment.cgi?id=11436&action=edit
f16-p8-p16-pointers.c

This bug is in Clang frontend. The test case is in attachment.

There are warnings about float16_t *, poly8_t * and poly16_t * when compiling
into AArch64 NEON code. To run the test case(AArch64):
./Debug+Asserts/bin/clang -cc1 -internal-isystem
./Debug+Asserts/lib/clang/3.4/include  -triple aarch64-none-linux-gnu
-target-feature +neon    -ffp-contract=fast -S -O3 -o - f16-p8-p16-pointer.c

f16-p8-p16-pointers.c:4:19: warning: incompatible pointer types assigning to
'const unsigned short *' from 'const float16_t *' (aka 'const half *')
  return vld1_f16(a);
                  ^
./Debug+Asserts/lib/clang/3.4/include/arm_neon.h:1456:38: note: expanded from
macro 'vld1_f16'
  (float16x4_t)__builtin_neon_vld1_v(__a, 6); })
                                     ^
...

The warning message of ARM NEON is like AArch64 but only float16_t pointer has
warning. To run the test case(ARM):
./Debug+Asserts/bin/clang -cc1 -internal-isystem
./Debug+Asserts/lib/clang/3.4/include -triple thumbv7s-apple-darwin -target-abi
apcs-gnu -target-cpu swift -ffreestanding -Os -S -o - f16-p8-p16-pointer.c


arm_neon.h and the test case have no problem. There may be some problem in
frontend but has not been found yet.

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