aarch64: Use RTL builtins for integer mla intrinsics

Rewrite integer mla Neon intrinsics to use RTL builtins rather than
inline assembly code, allowing for better scheduling and optimization.

gcc/Changelog:

2021-01-14  Jonathan Wright  <jonathan.wright@arm.com>

	* config/aarch64/aarch64-simd-builtins.def: Add mla builtin
	generator macro.
	* config/aarch64/arm_neon.h (vmla_s8): Use RTL builtin rather
	than asm.
	(vmla_s16): Likewise.
	(vmla_s32): Likewise.
	(vmla_u8): Likewise.
	(vmla_u16): Likewise.
	(vmla_u32): Likewise.
	(vmlaq_s8): Likewise.
	(vmlaq_s16): Likewise.
	(vmlaq_s32): Likewise.
	(vmlaq_u8): Likewise.
	(vmlaq_u16): Likewise.
	(vmlaq_u32): Likewise.

2 files changed, 27 insertions, 72 deletions

diff --git a/gcc/config/aarch64/aarch64-simd-builtins.def b/gcc/config/aarch64/aarch64-simd-builtins.def
index 168e47d..a233156 100644
--- a/gcc/config/aarch64/aarch64-simd-builtins.def
+++ b/gcc/config/aarch64/aarch64-simd-builtins.def
@@ -178,6 +178,9 @@
   /* Implemented by aarch64_xtn<mode>.  */
   BUILTIN_VQN (UNOP, xtn, 0, NONE)
 
+  /* Implemented by aarch64_mla<mode>.  */
+  BUILTIN_VDQ_BHSI (TERNOP, mla, 0, NONE)
+
   /* Implemented by aarch64_<su>mlsl<mode>.  */
   BUILTIN_VD_BHSI (TERNOP, smlsl, 0, NONE)
   BUILTIN_VD_BHSI (TERNOPU, umlsl, 0, NONE)
diff --git a/gcc/config/aarch64/arm_neon.h b/gcc/config/aarch64/arm_neon.h
index f7efee6..15fb345 100644
--- a/gcc/config/aarch64/arm_neon.h
+++ b/gcc/config/aarch64/arm_neon.h
@@ -7294,72 +7294,48 @@ __extension__ extern __inline int8x8_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmla_s8 (int8x8_t __a, int8x8_t __b, int8x8_t __c)
 {
-  int8x8_t __result;
-  __asm__ ("mla %0.8b, %2.8b, %3.8b"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return __builtin_aarch64_mlav8qi (__a, __b, __c);
 }
 
 __extension__ extern __inline int16x4_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmla_s16 (int16x4_t __a, int16x4_t __b, int16x4_t __c)
 {
-  int16x4_t __result;
-  __asm__ ("mla %0.4h, %2.4h, %3.4h"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return __builtin_aarch64_mlav4hi (__a, __b, __c);
 }
 
 __extension__ extern __inline int32x2_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmla_s32 (int32x2_t __a, int32x2_t __b, int32x2_t __c)
 {
-  int32x2_t __result;
-  __asm__ ("mla %0.2s, %2.2s, %3.2s"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return __builtin_aarch64_mlav2si (__a, __b, __c);
 }
 
 __extension__ extern __inline uint8x8_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmla_u8 (uint8x8_t __a, uint8x8_t __b, uint8x8_t __c)
 {
-  uint8x8_t __result;
-  __asm__ ("mla %0.8b, %2.8b, %3.8b"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return (uint8x8_t) __builtin_aarch64_mlav8qi ((int8x8_t) __a,
+                                                (int8x8_t) __b,
+                                                (int8x8_t) __c);
 }
 
 __extension__ extern __inline uint16x4_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmla_u16 (uint16x4_t __a, uint16x4_t __b, uint16x4_t __c)
 {
-  uint16x4_t __result;
-  __asm__ ("mla %0.4h, %2.4h, %3.4h"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return (uint16x4_t) __builtin_aarch64_mlav4hi ((int16x4_t) __a,
+                                                 (int16x4_t) __b,
+                                                 (int16x4_t) __c);
 }
 
 __extension__ extern __inline uint32x2_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmla_u32 (uint32x2_t __a, uint32x2_t __b, uint32x2_t __c)
 {
-  uint32x2_t __result;
-  __asm__ ("mla %0.2s, %2.2s, %3.2s"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return (uint32x2_t) __builtin_aarch64_mlav2si ((int32x2_t) __a,
+                                                 (int32x2_t) __b,
+                                                 (int32x2_t) __c);
 }
 
 #define vmlal_high_lane_s16(a, b, c, d)                                 \
@@ -7835,72 +7811,48 @@ __extension__ extern __inline int8x16_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmlaq_s8 (int8x16_t __a, int8x16_t __b, int8x16_t __c)
 {
-  int8x16_t __result;
-  __asm__ ("mla %0.16b, %2.16b, %3.16b"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return __builtin_aarch64_mlav16qi (__a, __b, __c);
 }
 
 __extension__ extern __inline int16x8_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmlaq_s16 (int16x8_t __a, int16x8_t __b, int16x8_t __c)
 {
-  int16x8_t __result;
-  __asm__ ("mla %0.8h, %2.8h, %3.8h"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return __builtin_aarch64_mlav8hi (__a, __b, __c);
 }
 
 __extension__ extern __inline int32x4_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmlaq_s32 (int32x4_t __a, int32x4_t __b, int32x4_t __c)
 {
-  int32x4_t __result;
-  __asm__ ("mla %0.4s, %2.4s, %3.4s"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return __builtin_aarch64_mlav4si (__a, __b, __c);
 }
 
 __extension__ extern __inline uint8x16_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmlaq_u8 (uint8x16_t __a, uint8x16_t __b, uint8x16_t __c)
 {
-  uint8x16_t __result;
-  __asm__ ("mla %0.16b, %2.16b, %3.16b"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return (uint8x16_t) __builtin_aarch64_mlav16qi ((int8x16_t) __a,
+                                                  (int8x16_t) __b,
+                                                  (int8x16_t) __c);
 }
 
 __extension__ extern __inline uint16x8_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmlaq_u16 (uint16x8_t __a, uint16x8_t __b, uint16x8_t __c)
 {
-  uint16x8_t __result;
-  __asm__ ("mla %0.8h, %2.8h, %3.8h"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return (uint16x8_t) __builtin_aarch64_mlav8hi ((int16x8_t) __a,
+                                                 (int16x8_t) __b,
+                                                 (int16x8_t) __c);
 }
 
 __extension__ extern __inline uint32x4_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vmlaq_u32 (uint32x4_t __a, uint32x4_t __b, uint32x4_t __c)
 {
-  uint32x4_t __result;
-  __asm__ ("mla %0.4s, %2.4s, %3.4s"
-           : "=w"(__result)
-           : "0"(__a), "w"(__b), "w"(__c)
-           : /* No clobbers */);
-  return __result;
+  return (uint32x4_t) __builtin_aarch64_mlav4si ((int32x4_t) __a,
+                                                 (int32x4_t) __b,
+                                                 (int32x4_t) __c);
 }
 
 __extension__ extern __inline float32x2_t