arm: Enable MVE SIMD modes for vectorization

This patch enables SIMD modes for MVE auto-vectorization.
In this patch, the integer and float MVE SIMD modes are returned by
arm_preferred_simd_mode (TARGET_VECTORIZE_PREFERRED_SIMD_MODE hook) when
MVE or MVE_FLOAT is enabled. Then the expanders for auto-vectorization
can be used for generating MVE SIMD code.

This patch also fixes bugs in MVE vreiterpretq_*.c tests which are
revealed by the enabled MVE SIMD modes.
The tests are for checking the MVE reinterpret intrinsics.
There are two functions in each of the tests. The two functions contain
the pattern of identical code so that they are folded in icf pass.
Because of icf, the instruction count only checks one function which is
8. However when the SIMD modes are enabled, the estimation of the code
size becomes smaller so that inlining is applied after icf, then the
instruction count becomes 16 which causes failure of the tests.
Because the icf is not the expected pattern to be tested but causes
above issues, -fno-ipa-icf is applied to the tests to avoid unstable
instruction count.

gcc/ChangeLog:

2020-10-05  Dennis Zhang  <dennis.zhang@arm.com>

	* config/arm/arm.c (arm_preferred_simd_mode): Enable MVE SIMD modes.

gcc/testsuite/ChangeLog:

2020-10-05  Dennis Zhang  <dennis.zhang@arm.com>

	* gcc.target/arm/mve/intrinsics/vreinterpretq_f16.c: Use additional
	option -fno-ipa-icf and change the instruction count from 8 to 16.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_s16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_s64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_s8.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_u16.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_u32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_u64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vreinterpretq_u8.c: Likewise.

13 files changed, 62 insertions, 20 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cd3901b..743e497 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2020-10-05  Dennis Zhang  <dennis.zhang@arm.com>
+
+	* config/arm/arm.c (arm_preferred_simd_mode): Enable MVE SIMD modes.
+
 2020-10-05  Aldy Hernandez  <aldyh@redhat.com>
 
 	* value-range.cc (irange::legacy_intersect): Only handle
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index bd7be8f..5fdc143 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -28964,6 +28964,30 @@ arm_preferred_simd_mode (scalar_mode mode)
       default:;
       }
 
+  if (TARGET_HAVE_MVE)
+    switch (mode)
+      {
+      case QImode:
+	return V16QImode;
+      case HImode:
+	return V8HImode;
+      case SImode:
+	return V4SImode;
+
+      default:;
+      }
+
+  if (TARGET_HAVE_MVE_FLOAT)
+    switch (mode)
+      {
+      case HFmode:
+	return V8HFmode;
+      case SFmode:
+	return V4SFmode;
+
+      default:;
+      }
+
   return word_mode;
 }
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5b92a02..703cc68 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,17 @@
+2020-10-05  Dennis Zhang  <dennis.zhang@arm.com>
+
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_f16.c: Use additional
+	option -fno-ipa-icf and change the instruction count from 8 to 16.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_f32.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_s16.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_s32.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_s64.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_s8.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_u16.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_u32.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_u64.c: Likewise.
+	* gcc.target/arm/mve/intrinsics/vreinterpretq_u8.c: Likewise.
+
 2020-10-05  Nathan Sidwell  <nathan@acm.org>
 
 	* c-c++-common/spellcheck-reserved.c: Restore diagnostic.
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f16.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f16.c
index f59f697..2398d89 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f16.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f16.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int8x16_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_f16 (r7, vreinterpretq_f16 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.f16" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.f16" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f32.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f32.c
index dac47c7..5a58dc6 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f32.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_f32.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int16x8_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_f32 (r7, vreinterpretq_f32 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.f32" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.f32" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s16.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s16.c
index edc2f2f..9ab05e9 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s16.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s16.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int8x16_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_s16 (r7, vreinterpretq_s16 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.i16" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.i16" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s32.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s32.c
index 880de06..fbfff1f 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s32.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s32.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int16x8_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_s32 (r7, vreinterpretq_s32 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.i32" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.i32" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s64.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s64.c
index b0e8154..beb6b92 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s64.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s64.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int16x8_t value1;
@@ -42,4 +42,4 @@ foo1 (mve_pred16_t __p)
   return vpselq_s64 (r7, vreinterpretq_s64 (value9), __p);
 }
 
-/* { dg-final { scan-assembler-times "vpsel" 8 } } */
+/* { dg-final { scan-assembler-times "vpsel" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s8.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s8.c
index a5ceebb..727d89b 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s8.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_s8.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int16x8_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_s8 (r7, vreinterpretq_s8 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.i8" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.i8" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u16.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u16.c
index cd31c23..600f6d7 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u16.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u16.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int8x16_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_u16 (r7, vreinterpretq_u16 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.i16" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.i16" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u32.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u32.c
index faa66c9..d536ae8 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u32.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u32.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int16x8_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_u32 (r7, vreinterpretq_u32 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.i32" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.i32" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u64.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u64.c
index 853b28a..abc4361 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u64.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u64.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int16x8_t value1;
@@ -42,4 +42,4 @@ foo1 (mve_pred16_t __p)
   return vpselq_u64 (r7, vreinterpretq_u64 (value9), __p);
 }
 
-/* { dg-final { scan-assembler-times "vpsel" 8 } } */
+/* { dg-final { scan-assembler-times "vpsel" 16 } } */
diff --git a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u8.c b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u8.c
index bdf8cd5..c138e5b 100644
--- a/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u8.c
+++ b/gcc/testsuite/gcc.target/arm/mve/intrinsics/vreinterpretq_u8.c
@@ -1,6 +1,6 @@
 /* { dg-require-effective-target arm_v8_1m_mve_fp_ok } */
 /* { dg-add-options arm_v8_1m_mve_fp } */
-/* { dg-additional-options "-O2" } */
+/* { dg-additional-options "-O2 -fno-ipa-icf" } */
 
 #include "arm_mve.h"
 int16x8_t value1;
@@ -41,4 +41,4 @@ foo1 ()
   return vaddq_u8 (r7, vreinterpretq_u8 (value9));
 }
 
-/* { dg-final { scan-assembler-times "vadd.i8" 8 } } */
+/* { dg-final { scan-assembler-times "vadd.i8" 16 } } */