aarch64: Relax aarch64_sqxtun2<mode> RTL pattern

Use UNSPEC_SQXTUN instead of UNSPEC_SQXTUN2 in aarch64_sqxtun2<mode>
patterns. This allows for more more aggressive combinations and
ultimately better code generation. The now redundant UNSPEC_SQXTUN2
is removed.

gcc/ChangeLog:

2021-05-14  Jonathn Wright  <jonathan.wright@arm.com>

	* config/aarch64/aarch64-simd.md: Use UNSPEC_SQXTUN instead
	of UNSPEC_SQXTUN2.
	* config/aarch64/iterators.md: Remove UNSPEC_SQXTUN2.

diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md
index 5473d61..7952309 100644 (file)
--- a/gcc/config/aarch64/aarch64-simd.md
+++ b/gcc/config/aarch64/aarch64-simd.md
@@ -4859,7 +4859,7 @@
        (vec_concat:<VNARROWQ2>
          (match_operand:<VNARROWQ> 1 "register_operand" "0")
          (unspec:<VNARROWQ>
-           [(match_operand:VQN 2 "register_operand" "w")] UNSPEC_SQXTUN2)))]
+           [(match_operand:VQN 2 "register_operand" "w")] UNSPEC_SQXTUN)))]
   "TARGET_SIMD && !BYTES_BIG_ENDIAN"
   "sqxtun2\\t%0.<V2ntype>, %2.<Vtype>"
    [(set_attr "type" "neon_sat_shift_imm_narrow_q")]
@@ -4869,7 +4869,7 @@
   [(set (match_operand:<VNARROWQ2> 0 "register_operand" "=w")
        (vec_concat:<VNARROWQ2>
          (unspec:<VNARROWQ>
-           [(match_operand:VQN 2 "register_operand" "w")] UNSPEC_SQXTUN2)
+           [(match_operand:VQN 2 "register_operand" "w")] UNSPEC_SQXTUN)
          (match_operand:<VNARROWQ> 1 "register_operand" "0")))]
   "TARGET_SIMD && BYTES_BIG_ENDIAN"
   "sqxtun2\\t%0.<V2ntype>, %2.<Vtype>"
@@ -4880,7 +4880,7 @@
   [(match_operand:<VNARROWQ2> 0 "register_operand")
    (match_operand:<VNARROWQ> 1 "register_operand")
    (unspec:<VNARROWQ>
-     [(match_operand:VQN 2 "register_operand")] UNSPEC_SQXTUN2)]
+     [(match_operand:VQN 2 "register_operand")] UNSPEC_SQXTUN)]
   "TARGET_SIMD"
   {
     if (BYTES_BIG_ENDIAN)

diff --git a/gcc/config/aarch64/iterators.md b/gcc/config/aarch64/iterators.md
index 29ce669..0ec93b0 100644 (file)
--- a/gcc/config/aarch64/iterators.md
+++ b/gcc/config/aarch64/iterators.md
@@ -521,7 +521,6 @@
     UNSPEC_USQADD      ; Used in aarch64-simd.md.
     UNSPEC_SUQADD      ; Used in aarch64-simd.md.
     UNSPEC_SQXTUN      ; Used in aarch64-simd.md.
-    UNSPEC_SQXTUN2     ; Used in aarch64-simd.md.
     UNSPEC_SSRA                ; Used in aarch64-simd.md.
     UNSPEC_USRA                ; Used in aarch64-simd.md.
     UNSPEC_SRSRA       ; Used in aarch64-simd.md.