[PATCH 1/3] arm: Fix sign of MVE predicate mve_pred16_t [PR 107674]

[Andre Vieira (lists) via Gcc-patches]

Hi,

The ACLE defines mve_pred16_t as an unsigned short.  This patch makes 
sure GCC treats the predicate as an unsigned type, rather than signed.

Bootstrapped on aarch64-none-eabi and regression tested on arm-none-eabi 
and armeb-none-eabi for armv8.1-m.main+mve.fp.

OK for trunk?

gcc/ChangeLog:

        PR target/107674
        * config/arm/arm-builtins.cc (arm_simd_builtin_type): Rewrite to use
        new qualifiers parameter and use unsigned short type for MVE predicate.
        (arm_init_builtin): Call arm_simd_builtin_type with qualifiers
        parameter.
        (arm_init_crypto_builtins): Likewise.

gcc/testsuite/ChangeLog:

        PR target/107674
        * gcc.target/arm/mve/mve_vpt.c: New test.diff --git a/gcc/config/arm/arm-builtins.cc b/gcc/config/arm/arm-builtins.cc
index 
11d7478d9df69139802a9d42c09dd0de7480b60e..6c67cec93ff76a4b42f3a0b305f697142e88fcd9
 100644
--- a/gcc/config/arm/arm-builtins.cc
+++ b/gcc/config/arm/arm-builtins.cc
@@ -1489,12 +1489,14 @@ arm_lookup_simd_builtin_type (machine_mode mode,
 }
 
 static tree
-arm_simd_builtin_type (machine_mode mode, bool unsigned_p, bool poly_p)
+arm_simd_builtin_type (machine_mode mode, enum arm_type_qualifiers qualifiers)
 {
-  if (poly_p)
+  if ((qualifiers & qualifier_poly) != 0)
     return arm_lookup_simd_builtin_type (mode, qualifier_poly);
-  else if (unsigned_p)
+  else if ((qualifiers & qualifier_unsigned) != 0)
     return arm_lookup_simd_builtin_type (mode, qualifier_unsigned);
+  else if ((qualifiers & qualifier_predicate) != 0)
+    return unsigned_intHI_type_node;
   else
     return arm_lookup_simd_builtin_type (mode, qualifier_none);
 }
@@ -1755,9 +1757,7 @@ arm_init_builtin (unsigned int fcode, arm_builtin_datum 
*d,
       else
        {
          eltype
-           = arm_simd_builtin_type (op_mode,
-                                    (qualifiers & qualifier_unsigned) != 0,
-                                    (qualifiers & qualifier_poly) != 0);
+           = arm_simd_builtin_type (op_mode, qualifiers);
          gcc_assert (eltype != NULL);
 
          /* Add qualifiers.  */
@@ -1929,10 +1929,10 @@ static void
 arm_init_crypto_builtins (void)
 {
   tree V16UQI_type_node
-    = arm_simd_builtin_type (V16QImode, true, false);
+    = arm_simd_builtin_type (V16QImode, qualifier_unsigned);
 
   tree V4USI_type_node
-    = arm_simd_builtin_type (V4SImode, true, false);
+    = arm_simd_builtin_type (V4SImode, qualifier_unsigned);
 
   tree v16uqi_ftype_v16uqi
     = build_function_type_list (V16UQI_type_node, V16UQI_type_node,
diff --git a/gcc/testsuite/gcc.target/arm/mve/mve_vpt.c 
b/gcc/testsuite/gcc.target/arm/mve/mve_vpt.c
new file mode 100644
index 
0000000000000000000000000000000000000000..26a565b79dd1348e361b3aa23a1d6e6d13bffce8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/mve/mve_vpt.c
@@ -0,0 +1,27 @@
+/* { dg-options "-O2" } */
+/* { dg-require-effective-target arm_v8_1m_mve_ok } */
+/* { dg-add-options arm_v8_1m_mve } */
+/* { dg-final { check-function-bodies "**" "" } } */
+#include <arm_mve.h>
+void test0 (uint8_t *a, uint8_t *b, uint8_t *c)
+{
+    uint8x16_t va = vldrbq_u8 (a);
+    uint8x16_t vb = vldrbq_u8 (b);
+    mve_pred16_t p = vcmpeqq_u8 (va, vb);
+    uint8x16_t vc = vaddq_x_u8 (va, vb, p);
+    vstrbq_p_u8 (c, vc, p);
+}
+/*
+** test0:
+**     vldrb.8 q2, \[r0\]
+**     vldrb.8 q1, \[r1\]
+**     vcmp.i8 eq, q2, q1
+**     vmrs    r3, p0  @ movhi
+**     uxth    r3, r3
+**     vmsr    p0, r3  @ movhi
+**     vpst
+**     vaddt.i8        q3, q2, q1
+**     vpst
+**     vstrbt.8        q3, \[r2\]
+**     bx      lr
+*/