Index: gcc/config/aarch64/aarch64-sve.md
===================================================================
--- gcc/config/aarch64/aarch64-sve.md	2019-08-14 10:28:46.145666799 +0100
+++ gcc/config/aarch64/aarch64-sve.md	2019-08-14 11:47:53.151171700 +0100
@@ -1454,6 +1454,45 @@ (define_insn "*<optab><mode>2"
   "<sve_int_op>\t%0.<Vetype>, %1/m, %2.<Vetype>"
 )
 
+;; Predicated integer unary arithmetic, merging with the first input.
+(define_insn "*cond_<optab><mode>_2"
+  [(set (match_operand:SVE_I 0 "register_operand" "=w, ?&w")
+	(unspec:SVE_I
+	  [(match_operand:<VPRED> 1 "register_operand" "Upl, Upl")
+	   (SVE_INT_UNARY:SVE_I
+	     (match_operand:SVE_I 2 "register_operand" "0, w"))
+	   (match_dup 2)]
+	  UNSPEC_SEL))]
+  "TARGET_SVE"
+  "@
+   <sve_int_op>\t%0.<Vetype>, %1/m, %0.<Vetype>
+   movprfx\t%0, %2\;<sve_int_op>\t%0.<Vetype>, %1/m, %2.<Vetype>"
+  [(set_attr "movprfx" "*,yes")]
+)
+
+;; Predicated integer unary arithmetic, 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 3 are the same,
+;; which is handled above rather than here.  Marking all the alternatives
+;; as earlyclobber helps to make the instruction more regular to the
+;; register allocator.
+(define_insn "*cond_<optab><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")
+	   (SVE_INT_UNARY:SVE_I
+	     (match_operand:SVE_I 2 "register_operand" "w, w, w"))
+	   (match_operand:SVE_I 3 "aarch64_simd_reg_or_zero" "0, Dz, w")]
+	  UNSPEC_SEL))]
+  "TARGET_SVE && !rtx_equal_p (operands[2], operands[3])"
+  "@
+   <sve_int_op>\t%0.<Vetype>, %1/m, %2.<Vetype>
+   movprfx\t%0.<Vetype>, %1/z, %2.<Vetype>\;<sve_int_op>\t%0.<Vetype>, %1/m, %2.<Vetype>
+   movprfx\t%0, %3\;<sve_int_op>\t%0.<Vetype>, %1/m, %2.<Vetype>"
+  [(set_attr "movprfx" "*,yes,yes")]
+)
+
 ;; -------------------------------------------------------------------------
 ;; ---- [INT] Logical inverse
 ;; -------------------------------------------------------------------------
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_unary_1.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_1.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,44 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define abs(A) ((A) < 0 ? -(A) : (A))
+#define neg(A) (-(A))
+
+#define DEF_LOOP(TYPE, OP)					\
+  void __attribute__ ((noipa))					\
+  test_##TYPE##_##OP (TYPE *__restrict r, TYPE *__restrict a,	\
+		      TYPE *__restrict pred, int n)		\
+  {								\
+    for (int i = 0; i < n; ++i)					\
+      r[i] = pred[i] ? OP (a[i]) : a[i];			\
+  }
+
+#define TEST_TYPE(T, TYPE) \
+  T (TYPE, abs) \
+  T (TYPE, neg)
+
+#define TEST_ALL(T) \
+  TEST_TYPE (T, int8_t) \
+  TEST_TYPE (T, int16_t) \
+  TEST_TYPE (T, int32_t) \
+  TEST_TYPE (T, int64_t)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* { dg-final { scan-assembler-not {\tmov\tz} } } */
+/* { dg-final { scan-assembler-not {\tmovprfx\t} } } */
+/* XFAILed because the ?: gets canonicalized so that the operation is in
+   the false arm.  */
+/* { dg-final { scan-assembler-not {\tsel\t} { xfail *-*-* } } } */
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_unary_1_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_1_run.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,27 @@
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_unary_1.c"
+
+#define N 99
+
+#define TEST_LOOP(TYPE, OP)					\
+  {								\
+    TYPE r[N], a[N], pred[N];					\
+    for (int i = 0; i < N; ++i)					\
+      {								\
+	a[i] = (i & 1 ? i : 3 * i) * (i % 3 == 0 ? 1 : -1);	\
+	pred[i] = (i % 7 < 4);					\
+	asm volatile ("" ::: "memory");				\
+      }								\
+    test_##TYPE##_##OP (r, a, pred, N);				\
+    for (int i = 0; i < N; ++i)					\
+      if (r[i] != (pred[i] ? OP (a[i]) : a[i]))			\
+	__builtin_abort ();					\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_unary_2.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_2.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,43 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define abs(A) ((A) < 0 ? -(A) : (A))
+#define neg(A) (-(A))
+
+#define DEF_LOOP(TYPE, OP)					\
+  void __attribute__ ((noipa))					\
+  test_##TYPE##_##OP (TYPE *__restrict r, TYPE *__restrict a,	\
+		      TYPE *__restrict b,			\
+		      TYPE *__restrict pred, int n)		\
+  {								\
+    for (int i = 0; i < n; ++i)					\
+      r[i] = pred[i] ? OP (a[i]) : b[i];			\
+  }
+
+#define TEST_TYPE(T, TYPE) \
+  T (TYPE, abs) \
+  T (TYPE, neg)
+
+#define TEST_ALL(T) \
+  TEST_TYPE (T, int8_t) \
+  TEST_TYPE (T, int16_t) \
+  TEST_TYPE (T, int32_t) \
+  TEST_TYPE (T, int64_t)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* { 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_unary_2_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_2_run.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,28 @@
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_unary_2.c"
+
+#define N 99
+
+#define TEST_LOOP(TYPE, OP)					\
+  {								\
+    TYPE r[N], a[N], b[N], pred[N];				\
+    for (int i = 0; i < N; ++i)					\
+      {								\
+	a[i] = (i & 1 ? i : 3 * i) * (i % 3 == 0 ? 1 : -1);	\
+	b[i] = (i % 9) * (i % 7 + 1);				\
+	pred[i] = (i % 7 < 4);					\
+	asm volatile ("" ::: "memory");				\
+      }								\
+    test_##TYPE##_##OP (r, a, b, pred, N);			\
+    for (int i = 0; i < N; ++i)					\
+      if (r[i] != (pred[i] ? OP (a[i]) : b[i]))			\
+	__builtin_abort ();					\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_unary_3.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_3.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,43 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define abs(A) ((A) < 0 ? -(A) : (A))
+#define neg(A) (-(A))
+
+#define DEF_LOOP(TYPE, OP)					\
+  void __attribute__ ((noipa))					\
+  test_##TYPE##_##OP (TYPE *__restrict r, TYPE *__restrict a,	\
+		      TYPE *__restrict pred, int n)		\
+  {								\
+    for (int i = 0; i < n; ++i)					\
+      r[i] = pred[i] ? OP (a[i]) : 5;				\
+  }
+
+#define TEST_TYPE(T, TYPE) \
+  T (TYPE, abs) \
+  T (TYPE, neg)
+
+#define TEST_ALL(T) \
+  TEST_TYPE (T, int8_t) \
+  TEST_TYPE (T, int16_t) \
+  TEST_TYPE (T, int32_t) \
+  TEST_TYPE (T, int64_t)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* { dg-final { scan-assembler-times {\tmovprfx\tz[0-9]+, z[0-9]+\n} 8 } } */
+
+/* { dg-final { scan-assembler-not {\tmov\tz[^\n]*z} } } */
+/* { dg-final { scan-assembler-not {\tsel\t} } } */
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_unary_3_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_3_run.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,27 @@
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_unary_3.c"
+
+#define N 99
+
+#define TEST_LOOP(TYPE, OP)					\
+  {								\
+    TYPE r[N], a[N], pred[N];					\
+    for (int i = 0; i < N; ++i)					\
+      {								\
+	a[i] = (i & 1 ? i : 3 * i) * (i % 3 == 0 ? 1 : -1);	\
+	pred[i] = (i % 7 < 4);					\
+	asm volatile ("" ::: "memory");				\
+      }								\
+    test_##TYPE##_##OP (r, a, pred, N);				\
+    for (int i = 0; i < N; ++i)					\
+      if (r[i] != (pred[i] ? OP (a[i]) : 5))			\
+	__builtin_abort ();					\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_unary_4.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_4.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,47 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include <stdint.h>
+
+#define abs(A) ((A) < 0 ? -(A) : (A))
+#define neg(A) (-(A))
+
+#define DEF_LOOP(TYPE, OP)					\
+  void __attribute__ ((noipa))					\
+  test_##TYPE##_##OP (TYPE *__restrict r, TYPE *__restrict a,	\
+		      TYPE *__restrict pred, int n)		\
+  {								\
+    for (int i = 0; i < n; ++i)					\
+      r[i] = pred[i] ? OP (a[i]) : 0;				\
+  }
+
+#define TEST_TYPE(T, TYPE) \
+  T (TYPE, abs) \
+  T (TYPE, neg)
+
+#define TEST_ALL(T) \
+  TEST_TYPE (T, int8_t) \
+  TEST_TYPE (T, int16_t) \
+  TEST_TYPE (T, int32_t) \
+  TEST_TYPE (T, int64_t)
+
+TEST_ALL (DEF_LOOP)
+
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tabs\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.b, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.h, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.s, p[0-7]/m,} 1 } } */
+/* { dg-final { scan-assembler-times {\tneg\tz[0-9]+\.d, p[0-7]/m,} 1 } } */
+
+/* Really we should be able to use MOVPRFX /z here, but at the moment
+   we're relying on combine to merge a SEL and an arithmetic operation,
+   and the SEL doesn't allow the "false" value to be zero when the "true"
+   value is a register.  */
+/* { dg-final { scan-assembler-times {\tmovprfx\tz[0-9]+, z[0-9]+\n} 8 } } */
+
+/* { dg-final { scan-assembler-not {\tmov\tz[^\n]*z} } } */
+/* { dg-final { scan-assembler-not {\tsel\t} } } */
Index: gcc/testsuite/gcc.target/aarch64/sve/cond_unary_4_run.c
===================================================================
--- /dev/null	2019-07-30 08:53:31.317691683 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/cond_unary_4_run.c	2019-08-14 11:47:53.151171700 +0100
@@ -0,0 +1,27 @@
+/* { dg-do run { target { aarch64_sve_hw } } } */
+/* { dg-options "-O2 -ftree-vectorize" } */
+
+#include "cond_unary_4.c"
+
+#define N 99
+
+#define TEST_LOOP(TYPE, OP)					\
+  {								\
+    TYPE r[N], a[N], pred[N];					\
+    for (int i = 0; i < N; ++i)					\
+      {								\
+	a[i] = (i & 1 ? i : 3 * i) * (i % 3 == 0 ? 1 : -1);	\
+	pred[i] = (i % 7 < 4);					\
+	asm volatile ("" ::: "memory");				\
+      }								\
+    test_##TYPE##_##OP (r, a, pred, N);				\
+    for (int i = 0; i < N; ++i)					\
+      if (r[i] != (pred[i] ? OP (a[i]) : 0))			\
+	__builtin_abort ();					\
+  }
+
+int main ()
+{
+  TEST_ALL (TEST_LOOP)
+  return 0;
+}
