[committed,AArch64] Use SVE UXT[BHW] as a form of predicated AND
diff mbox series

Message ID mpt36i4m2n3.fsf@arm.com
State New
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  • [committed,AArch64] Use SVE UXT[BHW] as a form of predicated AND
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Commit Message

Richard Sandiford Aug. 14, 2019, 11:01 a.m. UTC
UXTB, UXTH and UXTW are equivalent to predicated ANDs with the constants
0xff, 0xffff and 0xffffffff respectively.  This patch uses them in the
patterns for IFN_COND_AND.

Tested on aarch64-linux-gnu (with and without SVE) and aarch64_be-elf.
Applied as r274479.

Richard


2019-08-14  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64.c (aarch64_print_operand): Allow %e to
	take the equivalent mask, as well as a bit count.
	* config/aarch64/predicates.md (aarch64_sve_uxtb_immediate)
	(aarch64_sve_uxth_immediate, aarch64_sve_uxt_immediate)
	(aarch64_sve_pred_and_operand): New predicates.
	* config/aarch64/iterators.md (sve_pred_int_rhs2_operand): New
	code attribute.
	* config/aarch64/aarch64-sve.md
	(cond_<SVE_INT_BINARY:optab><SVE_I:mode>): Use it.
	(*cond_uxt<mode>_2, *cond_uxt<mode>_any): New patterns.

gcc/testsuite/
	* gcc.target/aarch64/sve/cond_uxt_1.c: New test.
	* gcc.target/aarch64/sve/cond_uxt_1_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_uxt_2.c: Likewise.
	* gcc.target/aarch64/sve/cond_uxt_2_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_uxt_3.c: Likewise.
	* gcc.target/aarch64/sve/cond_uxt_3_run.c: Likewise.
	* gcc.target/aarch64/sve/cond_uxt_4.c: Likewise.
	* gcc.target/aarch64/sve/cond_uxt_4_run.c: Likewise.

Patch
diff mbox series

Index: gcc/config/aarch64/aarch64.c
===================================================================
--- gcc/config/aarch64/aarch64.c	2019-08-14 10:18:10.642319210 +0100
+++ gcc/config/aarch64/aarch64.c	2019-08-14 12:00:03.209840337 +0100
@@ -8328,7 +8328,8 @@  sizetochar (int size)
      'D':		Take the duplicated element in a vector constant
 			and print it as an unsigned integer, in decimal.
      'e':		Print the sign/zero-extend size as a character 8->b,
-			16->h, 32->w.
+			16->h, 32->w.  Can also be used for masks:
+			0xff->b, 0xffff->h, 0xffffffff->w.
      'I':		If the operand is a duplicated vector constant,
 			replace it with the duplicated scalar.  If the
 			operand is then a floating-point constant, replace
@@ -8399,27 +8400,22 @@  aarch64_print_operand (FILE *f, rtx x, i
 
     case 'e':
       {
-	int n;
-
-	if (!CONST_INT_P (x)
-	    || (n = exact_log2 (INTVAL (x) & ~7)) <= 0)
+	x = unwrap_const_vec_duplicate (x);
+	if (!CONST_INT_P (x))
 	  {
 	    output_operand_lossage ("invalid operand for '%%%c'", code);
 	    return;
 	  }
 
-	switch (n)
+	HOST_WIDE_INT val = INTVAL (x);
+	if ((val & ~7) == 8 || val == 0xff)
+	  fputc ('b', f);
+	else if ((val & ~7) == 16 || val == 0xffff)
+	  fputc ('h', f);
+	else if ((val & ~7) == 32 || val == 0xffffffff)
+	  fputc ('w', f);
+	else
 	  {
-	  case 3:
-	    fputc ('b', f);
-	    break;
-	  case 4:
-	    fputc ('h', f);
-	    break;
-	  case 5:
-	    fputc ('w', f);
-	    break;
-	  default:
 	    output_operand_lossage ("invalid operand for '%%%c'", code);
 	    return;
 	  }
Index: gcc/config/aarch64/predicates.md
===================================================================
--- gcc/config/aarch64/predicates.md	2019-08-14 10:18:10.642319210 +0100
+++ gcc/config/aarch64/predicates.md	2019-08-14 12:00:03.209840337 +0100
@@ -606,11 +606,26 @@  (define_predicate "aarch64_sve_inc_dec_i
   (and (match_code "const,const_vector")
        (match_test "aarch64_sve_inc_dec_immediate_p (op)")))
 
+(define_predicate "aarch64_sve_uxtb_immediate"
+  (and (match_code "const_vector")
+       (match_test "GET_MODE_UNIT_BITSIZE (GET_MODE (op)) > 8")
+       (match_test "aarch64_const_vec_all_same_int_p (op, 0xff)")))
+
+(define_predicate "aarch64_sve_uxth_immediate"
+  (and (match_code "const_vector")
+       (match_test "GET_MODE_UNIT_BITSIZE (GET_MODE (op)) > 16")
+       (match_test "aarch64_const_vec_all_same_int_p (op, 0xffff)")))
+
 (define_predicate "aarch64_sve_uxtw_immediate"
   (and (match_code "const_vector")
        (match_test "GET_MODE_UNIT_BITSIZE (GET_MODE (op)) > 32")
        (match_test "aarch64_const_vec_all_same_int_p (op, 0xffffffff)")))
 
+(define_predicate "aarch64_sve_uxt_immediate"
+  (ior (match_operand 0 "aarch64_sve_uxtb_immediate")
+       (match_operand 0 "aarch64_sve_uxth_immediate")
+       (match_operand 0 "aarch64_sve_uxtw_immediate")))
+
 (define_predicate "aarch64_sve_logical_immediate"
   (and (match_code "const,const_vector")
        (match_test "aarch64_sve_bitmask_immediate_p (op)")))
@@ -670,6 +685,10 @@  (define_predicate "aarch64_sve_add_opera
        (match_operand 0 "aarch64_sve_sub_arith_immediate")
        (match_operand 0 "aarch64_sve_inc_dec_immediate")))
 
+(define_predicate "aarch64_sve_pred_and_operand"
+  (ior (match_operand 0 "register_operand")
+       (match_operand 0 "aarch64_sve_uxt_immediate")))
+
 (define_predicate "aarch64_sve_logical_operand"
   (ior (match_operand 0 "register_operand")
        (match_operand 0 "aarch64_sve_logical_immediate")))
Index: gcc/config/aarch64/iterators.md
===================================================================
--- gcc/config/aarch64/iterators.md	2019-08-14 10:28:46.145666799 +0100
+++ gcc/config/aarch64/iterators.md	2019-08-14 12:00:03.209840337 +0100
@@ -1525,6 +1525,20 @@  (define_code_attr sve_imm_prefix [(mult
 				  (umax "D")
 				  (umin "D")])
 
+;; The predicate to use for the second input operand in a cond_<optab><mode>
+;; pattern.
+(define_code_attr sve_pred_int_rhs2_operand
+  [(plus "register_operand")
+   (minus "register_operand")
+   (mult "register_operand")
+   (smax "register_operand")
+   (umax "register_operand")
+   (smin "register_operand")
+   (umin "register_operand")
+   (and "aarch64_sve_pred_and_operand")
+   (ior "register_operand")
+   (xor "register_operand")])
+
 ;; -------------------------------------------------------------------
 ;; Int Iterators.
 ;; -------------------------------------------------------------------
Index: gcc/config/aarch64/aarch64-sve.md
===================================================================
--- gcc/config/aarch64/aarch64-sve.md	2019-08-14 11:56:54.223221654 +0100
+++ gcc/config/aarch64/aarch64-sve.md	2019-08-14 12:00:03.205840369 +0100
@@ -54,6 +54,7 @@ 
 ;;
 ;; == Unary arithmetic
 ;; ---- [INT] General unary arithmetic corresponding to rtx codes
+;; ---- [INT] Zero extension
 ;; ---- [INT] Logical inverse
 ;; ---- [FP] General unary arithmetic corresponding to unspecs
 ;; ---- [PRED] Inverse
@@ -1494,6 +1495,58 @@  (define_insn "*cond_<optab><mode>_any"
 )
 
 ;; -------------------------------------------------------------------------
+;; ---- [INT] Zero extension
+;; -------------------------------------------------------------------------
+;; Includes:
+;; - UXTB
+;; - UXTH
+;; - UXTW
+;; -------------------------------------------------------------------------
+
+;; Match UXT[BHW] as a conditional AND of a constant, merging with the
+;; first input.
+(define_insn "*cond_uxt<mode>_2"
+  [(set (match_operand:SVE_I 0 "register_operand" "=w, ?&w")
+	(unspec:SVE_I
+	  [(match_operand:<VPRED> 1 "register_operand" "Upl, Upl")
+	   (and:SVE_I
+	     (match_operand:SVE_I 2 "register_operand" "0, w")
+	     (match_operand:SVE_I 3 "aarch64_sve_uxt_immediate"))
+	   (match_dup 2)]
+	  UNSPEC_SEL))]
+  "TARGET_SVE"
+  "@
+   uxt%e3\t%0.<Vetype>, %1/m, %0.<Vetype>
+   movprfx\t%0, %2\;uxt%e3\t%0.<Vetype>, %1/m, %2.<Vetype>"
+  [(set_attr "movprfx" "*,yes")]
+)
+
+;; Match UXT[BHW] as a conditional AND of a constant, merging with an
+;; independent value.
+;;
+;; The earlyclobber isn't needed for the first alternative, but omitting
+;; it would only help the case in which operands 2 and 4 are the same,
+;; which is handled above rather than here.  Marking all the alternatives
+;; as early-clobber helps to make the instruction more regular to the
+;; register allocator.
+(define_insn "*cond_uxt<mode>_any"
+  [(set (match_operand:SVE_I 0 "register_operand" "=&w, ?&w, ?&w")
+	(unspec:SVE_I
+	  [(match_operand:<VPRED> 1 "register_operand" "Upl, Upl, Upl")
+	   (and:SVE_I
+	     (match_operand:SVE_I 2 "register_operand" "w, w, w")
+	     (match_operand:SVE_I 3 "aarch64_sve_uxt_immediate"))
+	   (match_operand:SVE_I 4 "aarch64_simd_reg_or_zero" "0, Dz, w")]
+	  UNSPEC_SEL))]
+  "TARGET_SVE && !rtx_equal_p (operands[2], operands[4])"
+  "@
+   uxt%e3\t%0.<Vetype>, %1/m, %2.<Vetype>
+   movprfx\t%0.<Vetype>, %1/z, %2.<Vetype>\;uxt%e3\t%0.<Vetype>, %1/m, %2.<Vetype>
+   movprfx\t%0, %4\;uxt%e3\t%0.<Vetype>, %1/m, %2.<Vetype>"
+  [(set_attr "movprfx" "*,yes,yes")]
+)
+
+;; -------------------------------------------------------------------------
 ;; ---- [INT] Logical inverse
 ;; -------------------------------------------------------------------------
 
@@ -1794,7 +1847,7 @@  (define_expand "cond_<optab><mode>"
 	  [(match_operand:<VPRED> 1 "register_operand")
 	   (SVE_INT_BINARY:SVE_I
 	     (match_operand:SVE_I 2 "register_operand")
-	     (match_operand:SVE_I 3 "register_operand"))
+	     (match_operand:SVE_I 3 "<sve_pred_int_rhs2_operand>"))
 	   (match_operand:SVE_I 4 "aarch64_simd_reg_or_zero")]
 	  UNSPEC_SEL))]
   "TARGET_SVE"
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_1.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_1.c	2019-08-14 12:00:03.209840337 +0100
@@ -0,0 +1,40 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define NUM_ELEMS(TYPE) (320 / sizeof (TYPE))
+
+#define DEF_LOOP(TYPE, CONST)					\
+  void __attribute__ ((noipa))					\
+  test_##CONST##_##TYPE (TYPE *restrict r, TYPE *restrict a,	\
+			 TYPE *restrict b)			\
+  {								\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)			\
+      r[i] = a[i] > 20 ? b[i] & CONST : b[i];			\
+  }
+
+#define TEST_ALL(T)			\
+  T (uint16_t, 0xff)			\
+					\
+  T (uint32_t, 0xff)			\
+  T (uint32_t, 0xffff)			\
+					\
+  T (uint64_t, 0xff)			\
+  T (uint64_t, 0xffff)			\
+  T (uint64_t, 0xffffffff)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler {\tld1h\t(z[0-9]+\.h), p[0-7]/z, \[x2,[^L]*\tuxtb\t\1, p[0-7]/m, \1\n} } } */
+
+/* { dg-final { scan-assembler {\tld1w\t(z[0-9]+\.s), p[0-7]/z, \[x2,[^L]*\tuxtb\t\1, p[0-7]/m, \1\n} } } */
+/* { dg-final { scan-assembler {\tld1w\t(z[0-9]+\.s), p[0-7]/z, \[x2,[^L]*\tuxth\t\1, p[0-7]/m, \1\n} } } */
+
+/* { dg-final { scan-assembler {\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x2,[^L]*\tuxtb\t\1, p[0-7]/m, \1\n} } } */
+/* { dg-final { scan-assembler {\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x2,[^L]*\tuxth\t\1, p[0-7]/m, \1\n} } } */
+/* { dg-final { scan-assembler {\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x2,[^L]*\tuxtw\t\1, p[0-7]/m, \1\n} } } */
+
+/* { dg-final { scan-assembler-not {\tmov\tz} } } */
+/* { dg-final { scan-assembler-not {\tmovprfx\t} } } */
+/* { dg-final { scan-assembler-not {\tsel\t} } } */
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_1_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_1_run.c	2019-08-14 12:00:03.209840337 +0100
@@ -0,0 +1,27 @@ 
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_uxt_1.c"
+
+#define TEST_LOOP(TYPE, CONST)				\
+  {							\
+    TYPE r[NUM_ELEMS (TYPE)];				\
+    TYPE a[NUM_ELEMS (TYPE)];				\
+    TYPE b[NUM_ELEMS (TYPE)];				\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      {							\
+	a[i] = (i & 1 ? i : 3 * i);			\
+	b[i] = (i >> 4) << (i & 15);			\
+	asm volatile ("" ::: "memory");			\
+      }							\
+    test_##CONST##_##TYPE (r, a, b);			\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      if (r[i] != (a[i] > 20 ? b[i] & CONST : b[i]))	\
+	__builtin_abort ();				\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_2.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_2.c	2019-08-14 12:00:03.209840337 +0100
@@ -0,0 +1,40 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define NUM_ELEMS(TYPE) (320 / sizeof (TYPE))
+
+#define DEF_LOOP(TYPE, CONST)					\
+  void __attribute__ ((noipa))					\
+  test_##CONST##_##TYPE (TYPE *restrict r, TYPE *restrict a,	\
+			 TYPE *restrict b)			\
+  {								\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)			\
+      r[i] = a[i] > 20 ? b[i] & CONST : a[i];			\
+  }
+
+#define TEST_ALL(T)			\
+  T (uint16_t, 0xff)			\
+					\
+  T (uint32_t, 0xff)			\
+  T (uint32_t, 0xffff)			\
+					\
+  T (uint64_t, 0xff)			\
+  T (uint64_t, 0xffff)			\
+  T (uint64_t, 0xffffffff)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler {\tld1h\t(z[0-9]+\.h), p[0-7]/z, \[x1,[^L]*\tld1h\t(z[0-9]+\.h), p[0-7]/z, \[x2,[^L]*\tuxtb\t\1, p[0-7]/m, \2\n} } } */
+
+/* { dg-final { scan-assembler {\tld1w\t(z[0-9]+\.s), p[0-7]/z, \[x1,[^L]*\tld1w\t(z[0-9]+\.s), p[0-7]/z, \[x2,[^L]*\tuxtb\t\1, p[0-7]/m, \2\n} } } */
+/* { dg-final { scan-assembler {\tld1w\t(z[0-9]+\.s), p[0-7]/z, \[x1,[^L]*\tld1w\t(z[0-9]+\.s), p[0-7]/z, \[x2,[^L]*\tuxth\t\1, p[0-7]/m, \2\n} } } */
+
+/* { dg-final { scan-assembler {\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x1,[^L]*\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x2,[^L]*\tuxtb\t\1, p[0-7]/m, \2\n} } } */
+/* { dg-final { scan-assembler {\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x1,[^L]*\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x2,[^L]*\tuxth\t\1, p[0-7]/m, \2\n} } } */
+/* { dg-final { scan-assembler {\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x1,[^L]*\tld1d\t(z[0-9]+\.d), p[0-7]/z, \[x2,[^L]*\tuxtw\t\1, p[0-7]/m, \2\n} } } */
+
+/* { dg-final { scan-assembler-not {\tmov\tz} } } */
+/* { dg-final { scan-assembler-not {\tmovprfx\t} } } */
+/* { dg-final { scan-assembler-not {\tsel\t} } } */
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_2_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_2_run.c	2019-08-14 12:00:03.213840310 +0100
@@ -0,0 +1,27 @@ 
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_uxt_2.c"
+
+#define TEST_LOOP(TYPE, CONST)				\
+  {							\
+    TYPE r[NUM_ELEMS (TYPE)];				\
+    TYPE a[NUM_ELEMS (TYPE)];				\
+    TYPE b[NUM_ELEMS (TYPE)];				\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      {							\
+	a[i] = (i & 1 ? i : 3 * i);			\
+	b[i] = (i >> 4) << (i & 15);			\
+	asm volatile ("" ::: "memory");			\
+      }							\
+    test_##CONST##_##TYPE (r, a, b);			\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      if (r[i] != (a[i] > 20 ? b[i] & CONST : a[i]))	\
+	__builtin_abort ();				\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_3.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_3.c	2019-08-14 12:00:03.213840310 +0100
@@ -0,0 +1,39 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define NUM_ELEMS(TYPE) (320 / sizeof (TYPE))
+
+#define DEF_LOOP(TYPE, CONST)					\
+  void __attribute__ ((noipa))					\
+  test_##CONST##_##TYPE (TYPE *restrict r, TYPE *restrict a,	\
+			 TYPE *restrict b)			\
+  {								\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)			\
+      r[i] = a[i] > 20 ? b[i] & CONST : 127;			\
+  }
+
+#define TEST_ALL(T)			\
+  T (uint16_t, 0xff)			\
+					\
+  T (uint32_t, 0xff)			\
+  T (uint32_t, 0xffff)			\
+					\
+  T (uint64_t, 0xff)			\
+  T (uint64_t, 0xffff)			\
+  T (uint64_t, 0xffffffff)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+), z[0-9]+\n\tuxtb\t\1\.h, p[0-7]/m, z[0-9]+\.h\n} } } */
+
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+), z[0-9]+\n\tuxtb\t\1\.s, p[0-7]/m, z[0-9]+\.s\n} } } */
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+), z[0-9]+\n\tuxth\t\1\.s, p[0-7]/m, z[0-9]+\.s\n} } } */
+
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+), z[0-9]+\n\tuxtb\t\1\.d, p[0-7]/m, z[0-9]+\.d\n} } } */
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+), z[0-9]+\n\tuxth\t\1\.d, p[0-7]/m, z[0-9]+\.d\n} } } */
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+), z[0-9]+\n\tuxtw\t\1\.d, p[0-7]/m, z[0-9]+\.d\n} } } */
+
+/* { dg-final { scan-assembler-not {\tmov\tz[^\n]*z} } } */
+/* { dg-final { scan-assembler-not {\tsel\t} } } */
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_3_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_3_run.c	2019-08-14 12:00:03.213840310 +0100
@@ -0,0 +1,27 @@ 
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_uxt_3.c"
+
+#define TEST_LOOP(TYPE, CONST)				\
+  {							\
+    TYPE r[NUM_ELEMS (TYPE)];				\
+    TYPE a[NUM_ELEMS (TYPE)];				\
+    TYPE b[NUM_ELEMS (TYPE)];				\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      {							\
+	a[i] = (i & 1 ? i : 3 * i);			\
+	b[i] = (i >> 4) << (i & 15);			\
+	asm volatile ("" ::: "memory");			\
+      }							\
+    test_##CONST##_##TYPE (r, a, b);			\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      if (r[i] != (a[i] > 20 ? b[i] & CONST : 127))	\
+	__builtin_abort ();				\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_4.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_4.c	2019-08-14 12:00:03.213840310 +0100
@@ -0,0 +1,36 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define NUM_ELEMS(TYPE) (320 / sizeof (TYPE))
+
+#define DEF_LOOP(TYPE, CONST)					\
+  void __attribute__ ((noipa))					\
+  test_##CONST##_##TYPE (TYPE *restrict r, TYPE *restrict a,	\
+			 TYPE *restrict b)			\
+  {								\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)			\
+      r[i] = a[i] > 20 ? b[i] & CONST : 0;			\
+  }
+
+#define TEST_ALL(T)			\
+  T (uint16_t, 0xff)			\
+					\
+  T (uint32_t, 0xff)			\
+  T (uint32_t, 0xffff)			\
+					\
+  T (uint64_t, 0xff)			\
+  T (uint64_t, 0xffff)			\
+  T (uint64_t, 0xffffffff)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+\.h), (p[0-7])/z, z[0-9]+\.h\n\tuxtb\t\1, \2/m, z[0-9]+\.h\n} } } */
+
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+\.s), (p[0-7])/z, z[0-9]+\.s\n\tuxtb\t\1, \2/m, z[0-9]+\.s\n} } } */
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+\.s), (p[0-7])/z, z[0-9]+\.s\n\tuxth\t\1, \2/m, z[0-9]+\.s\n} } } */
+
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+\.d), (p[0-7])/z, z[0-9]+\.d\n\tuxtb\t\1, \2/m, z[0-9]+\.d\n} } } */
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+\.d), (p[0-7])/z, z[0-9]+\.d\n\tuxth\t\1, \2/m, z[0-9]+\.d\n} } } */
+/* { dg-final { scan-assembler {\tmovprfx\t(z[0-9]+\.d), (p[0-7])/z, z[0-9]+\.d\n\tuxtw\t\1, \2/m, z[0-9]+\.d\n} } } */
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_4_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_uxt_4_run.c	2019-08-14 12:00:03.213840310 +0100
@@ -0,0 +1,27 @@ 
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_uxt_4.c"
+
+#define TEST_LOOP(TYPE, CONST)				\
+  {							\
+    TYPE r[NUM_ELEMS (TYPE)];				\
+    TYPE a[NUM_ELEMS (TYPE)];				\
+    TYPE b[NUM_ELEMS (TYPE)];				\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      {							\
+	a[i] = (i & 1 ? i : 3 * i);			\
+	b[i] = (i >> 4) << (i & 15);			\
+	asm volatile ("" ::: "memory");			\
+      }							\
+    test_##CONST##_##TYPE (r, a, b);			\
+    for (int i = 0; i < NUM_ELEMS (TYPE); ++i)		\
+      if (r[i] != (a[i] > 20 ? b[i] & CONST : 0))	\
+	__builtin_abort ();				\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}