aarch64_emit_approx_sqrt handles both vectors and scalars and was using
mode_for_int_vector even for the scalar case. Although that happened
to work, it isn't how mode_for_int_vector is supposed to be used.
Tested on aarch64-linux-gnu and applied as r277311.
Richard
2019-10-23 Richard Sandiford <richard.sandif...@arm.com>
gcc/
* config/aarch64/aarch64.c (aarch64_emit_approx_sqrt): Use
int_mode_for_mode rather than mode_for_int_vector for scalars.
Index: gcc/config/aarch64/aarch64.c
===================================================================
--- gcc/config/aarch64/aarch64.c 2019-10-22 08:46:57.363355908 +0100
+++ gcc/config/aarch64/aarch64.c 2019-10-23 11:30:08.169740215 +0100
@@ -11828,7 +11828,9 @@ aarch64_emit_approx_sqrt (rtx dst, rtx s
/* Caller assumes we cannot fail. */
gcc_assert (use_rsqrt_p (mode));
- machine_mode mmsk = mode_for_int_vector (mode).require ();
+ machine_mode mmsk = (VECTOR_MODE_P (mode)
+ ? mode_for_int_vector (mode).require ()
+ : int_mode_for_mode (mode).require ());
rtx xmsk = gen_reg_rtx (mmsk);
if (!recp)
/* When calculating the approximate square root, compare the
