[PATCH v3 03/15] arm: Add tests for PR target/101325

[Christophe Lyon via Gcc-patches]

These tests are derived from the one provided in the PR: there is a
compile-only test because I did not have access to anything that could
execute MVE code until recently.
I have been able to add an executable test since QEMU supports MVE.

Instead of adding arm_v8_1m_mve_hw, I update arm_mve_hw so that it
uses add_options_for_arm_v8_1m_mve_fp, like arm_neon_hw does.  This
ensures arm_mve_hw passes even if the toolchain does not generate MVE
code by default.

2022-01-13  Christophe Lyon  <christophe.l...@foss.st.com>

        gcc/testsuite/
        PR target/101325
        * gcc.target/arm/simd/pr101325.c: New.
        * gcc.target/arm/simd/pr101325-2.c: New.
        * lib/target-supports.exp (check_effective_target_arm_mve_hw): Use
        add_options_for_arm_v8_1m_mve_fp.

diff --git a/gcc/testsuite/gcc.target/arm/simd/pr101325-2.c 
b/gcc/testsuite/gcc.target/arm/simd/pr101325-2.c
new file mode 100644
index 00000000000..355f6473a00
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/simd/pr101325-2.c
@@ -0,0 +1,19 @@
+/* { dg-do run } */
+/* { dg-require-effective-target arm_mve_hw } */
+/* { dg-options "-O3" } */
+/* { dg-add-options arm_v8_1m_mve } */
+
+#include <arm_mve.h>
+
+
+__attribute((noipa))
+unsigned foo(int8x16_t v, int8x16_t w)
+{
+  return vcmpeqq (v, w);
+}
+
+int main(void)
+{
+  if (foo (vdupq_n_s8(0), vdupq_n_s8(0)) != 0xffffU)
+    __builtin_abort ();
+}
diff --git a/gcc/testsuite/gcc.target/arm/simd/pr101325.c 
b/gcc/testsuite/gcc.target/arm/simd/pr101325.c
new file mode 100644
index 00000000000..4cb2513da87
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/simd/pr101325.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target arm_v8_1m_mve_ok } */
+/* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-O3" } */
+
+#include <arm_mve.h>
+
+unsigned foo(int8x16_t v, int8x16_t w)
+{
+  return vcmpeqq (v, w);
+}
+/* { dg-final { scan-assembler {\tvcmp.i8  eq} } } */
+/* { dg-final { scan-assembler {\tvmrs\tr[0-9]+, P0} } } */
+/* { dg-final { scan-assembler {\tuxth} } } */
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index b4bf2e6b495..0fe1e1e077a 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -5037,6 +5037,7 @@ proc check_effective_target_arm_cmse_hw { } {
        }
     } "-mcmse"]
 }
+
 # Return 1 if the target supports executing MVE instructions, 0
 # otherwise.
 
@@ -5052,7 +5053,7 @@ proc check_effective_target_arm_mve_hw {} {
               : "0" (a), "r" (b));
          return (a != 2);
        }
-    } ""]
+    } [add_options_for_arm_v8_1m_mve_fp ""]]
 }
 
 # Return 1 if this is an ARM target where ARMv8-M Security Extensions with
-- 
2.25.1