[gcc r14-66] aarch64: Delete __builtin_aarch64_neg* builtins and their use

[gcc r14-66] aarch64: Delete __builtin_aarch64_neg* builtins and their use

[Kyrylo Tkachov]

https://gcc.gnu.org/g:9bc407c787771baad6c69cee3e392f15a5b9163d

commit r14-66-g9bc407c787771baad6c69cee3e392f15a5b9163d
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date:   Wed Apr 19 10:32:07 2023 +0100

    aarch64: Delete __builtin_aarch64_neg* builtins and their use
    
    I don't think we need to keep the __builtin_aarch64_neg* builtins around.
    They are only used once in the vnegh_f16 intrinsic in arm_fp16.h and I AFAICT
    it was added this way only for the sake of orthogonality in
    https://gcc.gnu.org/g:d7f33f07d88984cbe769047e3d07fc21067fbba9
    We already use normal "-" negation in the other vneg* intrinsics, so do so here as well.
    
    Bootstrapped and tested on aarch64-none-linux-gnu.
    
    gcc/ChangeLog:
    
            * config/aarch64/aarch64-simd-builtins.def (neg): Delete builtins
            definition.
            * config/aarch64/arm_fp16.h (vnegh_f16): Reimplement using normal negation.

Diff:
---
 gcc/config/aarch64/aarch64-simd-builtins.def | 3 ---
 gcc/config/aarch64/arm_fp16.h                | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/gcc/config/aarch64/aarch64-simd-builtins.def b/gcc/config/aarch64/aarch64-simd-builtins.def
index ea5fd33a28a..1beaa08c1e7 100644
--- a/gcc/config/aarch64/aarch64-simd-builtins.def
+++ b/gcc/config/aarch64/aarch64-simd-builtins.def
@@ -848,9 +848,6 @@
   BUILTIN_VHSDF_HSDF (BINOP_USS, cmle, 0, FP)
   BUILTIN_VHSDF_HSDF (BINOP_USS, cmlt, 0, FP)
 
-  /* Implemented by neg<mode>2.  */
-  BUILTIN_VHSDF_HSDF (UNOP, neg, 2, ALL)
-
   /* Implemented by aarch64_fac<optab><mode>.  */
   BUILTIN_VHSDF_HSDF (BINOP_USS, faclt, 0, FP)
   BUILTIN_VHSDF_HSDF (BINOP_USS, facle, 0, FP)
diff --git a/gcc/config/aarch64/arm_fp16.h b/gcc/config/aarch64/arm_fp16.h
index a8fa4dbbdfe..350f8cc33d9 100644
--- a/gcc/config/aarch64/arm_fp16.h
+++ b/gcc/config/aarch64/arm_fp16.h
@@ -334,7 +334,7 @@ __extension__ extern __inline float16_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vnegh_f16 (float16_t __a)
 {
-  return __builtin_aarch64_neghf (__a);
+  return -__a;
 }
 
 __extension__ extern __inline float16_t