[PATCH][AArch64] Implement vsqrt_f64 intrinsic

[Kyrill Tkachov]

Hi all,

This patch implements the vsqrt_f64 intrinsic in arm_neon.h.
There's not much to it, we can reuse __builtin_sqrt.
It's a fairly straightforward and self-contained patch,
do we still want it at this stage?

A new execute test is added.

Tested aarch64-none-elf.


Thanks,
Kyrill

2014-11-17  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

    * config/aarch64/arm_neon.h (vsqrt_f64): New intrinsic.

2014-11-17  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

    * gcc.target/aarch64/simd/vsqrt_f64_1.c
commit d9e42debe2655287eef7b8c3ecf29bbdd11e6425
Author: Kyrylo Tkachov <kyrylo.tkac...@arm.com>
Date:   Mon Nov 17 15:02:01 2014 +0000

    [AArch64] Implement vsqrt_f64 intrinsic

diff --git a/gcc/config/aarch64/arm_neon.h b/gcc/config/aarch64/arm_neon.h
index b3b80b8..c58213a 100644
--- a/gcc/config/aarch64/arm_neon.h
+++ b/gcc/config/aarch64/arm_neon.h
@@ -22792,6 +22792,12 @@ vsqrtq_f32 (float32x4_t a)
   return __builtin_aarch64_sqrtv4sf (a);
 }
 
+__extension__ static __inline float64x1_t __attribute__ ((__always_inline__))
+vsqrt_f64 (float64x1_t a)
+{
+  return (float64x1_t) { __builtin_sqrt (a[0]) };
+}
+
 __extension__ static __inline float64x2_t __attribute__ ((__always_inline__))
 vsqrtq_f64 (float64x2_t a)
 {
diff --git a/gcc/testsuite/gcc.target/aarch64/simd/vsqrt_f64_1.c b/gcc/testsuite/gcc.target/aarch64/simd/vsqrt_f64_1.c
new file mode 100644
index 0000000..57fb6bb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/simd/vsqrt_f64_1.c
@@ -0,0 +1,25 @@
+/* Test the vsqrt_f64 AArch64 SIMD intrinsic.  */
+
+/* { dg-do run } */
+/* { dg-options "-save-temps -O3" } */
+
+#include "arm_neon.h"
+
+extern void abort (void);
+
+
+int
+main (void)
+{
+  float64x1_t in = vcreate_f64(0x3febd3e560634d7bULL);
+  float64x1_t result = vsqrt_f64 (in);
+  float64_t expected = 0.9325321502142351;
+
+  if (result[0] != expected)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-assembler "fsqrt\[ \t\]+\[dD\]\[0-9\]+, \[dD\]\[0-9\]+\n" } } */
+/* { dg-final { cleanup-saved-temps } } */