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[PATCH, AARCH64] Implement vector alignment target hooks.
- From: Tejas Belagod <tbelagod at arm dot com>
- To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Wed, 28 Nov 2012 16:34:18 +0000
- Subject: [PATCH, AARCH64] Implement vector alignment target hooks.
Hi,
The attached patch implements vector alignment hooks
TARGET_VECTOR_ALIGNMENT
TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE
TARGET_VECTORIZE_SUPPORT_VECTOR_MISALIGNMENT
Regression tested on aarch64-none-elf. OK for aarch64-4.7 and trunk?
Thanks,
Tejas Belagod.
ARM.
Changelog:
2012-11-28 Tejas Belagod <tejas.belagod@arm.com>
gcc/
* config/aarch64/aarch64.c (aarch64_simd_vector_alignment,
aarch64_simd_vector_alignment_reachable): New.
(TARGET_VECTOR_ALIGNMENT, TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE):
Define.
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index b36be90..9bf6a13 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -6691,6 +6691,31 @@ aarch64_simd_attr_length_move (rtx insn)
return 4;
}
+/* Implement target hook TARGET_VECTOR_ALIGNMENT. The AAPCS64 sets the maximum
+ alignment of a vector to 128 bits. */
+static HOST_WIDE_INT
+aarch64_simd_vector_alignment (const_tree type)
+{
+ HOST_WIDE_INT align = tree_low_cst (TYPE_SIZE (type), 0);
+ return MIN (align, 128);
+}
+
+/* Implement target hook TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE. */
+static bool
+aarch64_simd_vector_alignment_reachable (const_tree type, bool is_packed)
+{
+ if (is_packed)
+ return false;
+
+ /* We guarantee alignment for vectors up to 128-bits. */
+ if (tree_int_cst_compare (TYPE_SIZE (type),
+ bitsize_int (BIGGEST_ALIGNMENT)) > 0)
+ return false;
+
+ /* Vectors whose size is <= BIGGEST_ALIGNMENT are naturally aligned. */
+ return true;
+}
+
static unsigned HOST_WIDE_INT
aarch64_shift_truncation_mask (enum machine_mode mode)
{
@@ -6988,6 +7013,13 @@ aarch64_c_mode_for_suffix (char suffix)
#undef TARGET_VECTORIZE_PREFERRED_SIMD_MODE
#define TARGET_VECTORIZE_PREFERRED_SIMD_MODE aarch64_preferred_simd_mode
+#undef TARGET_VECTOR_ALIGNMENT
+#define TARGET_VECTOR_ALIGNMENT aarch64_simd_vector_alignment
+
+#undef TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE
+#define TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE \
+ aarch64_simd_vector_alignment_reachable
+
struct gcc_target targetm = TARGET_INITIALIZER;
#include "gt-aarch64.h"