SVE intrinsics: Fold svaba with op1 all zeros to svabd.

Similar to
https://gcc.gnu.org/pipermail/gcc-patches/2024-October/665780.html,
this patch implements folding of svaba to svabd if op1 is all zeros,
resulting in the use of UABD/SABD instructions instead of UABA/SABA.
Tests were added to check the produced assembly for use of UABD/SABD,
also for the _n case.

The patch was bootstrapped and regtested on aarch64-linux-gnu, no regression.
OK for mainline?

Signed-off-by: Jennifer Schmitz <jschmitz@nvidia.com>

gcc/
	* config/aarch64/aarch64-sve-builtins-sve2.cc
	(svaba_impl::fold): Fold svaba to svabd if op1 is all zeros.

gcc/testsuite/
	* gcc.target/aarch64/sve2/acle/asm/aba_s32.c: New tests.
	* gcc.target/aarch64/sve2/acle/asm/aba_s64.c: Likewise.
	* gcc.target/aarch64/sve2/acle/asm/aba_u32.c: Likewise.
	* gcc.target/aarch64/sve2/acle/asm/aba_u64.c: Likewise.

5 files changed, 107 insertions, 0 deletions

diff --git a/gcc/config/aarch64/aarch64-sve-builtins-sve2.cc b/gcc/config/aarch64/aarch64-sve-builtins-sve2.cc
index ddd6e46..d29c220 100644
--- a/gcc/config/aarch64/aarch64-sve-builtins-sve2.cc
+++ b/gcc/config/aarch64/aarch64-sve-builtins-sve2.cc
@@ -81,6 +81,24 @@ unspec_sqrdcmlah (int rot)
 class svaba_impl : public function_base
 {
 public:
+  gimple *
+  fold (gimple_folder &f) const override
+  {
+    /* Fold to svabd if op1 is all zeros.  */
+    tree op1 = gimple_call_arg (f.call, 0);
+    if (!integer_zerop (op1))
+      return NULL;
+    function_instance instance ("svabd", functions::svabd,
+				shapes::binary_opt_n, f.mode_suffix_id,
+				f.type_suffix_ids, GROUP_none, PRED_x);
+    gcall *call = f.redirect_call (instance);
+    /* Add a ptrue as predicate, because unlike svaba, svabd is
+       predicated.  */
+    gimple_call_set_arg (call, 0, build_all_ones_cst (f.gp_type ()));
+    return call;
+  }
+
+public:
   rtx
   expand (function_expander &e) const override
   {
diff --git a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s32.c b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s32.c
index 73c0028..655ad63 100644
--- a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s32.c
+++ b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s32.c
@@ -108,3 +108,26 @@ TEST_UNIFORM_Z (aba_11_s32_tied2, svint32_t,
 TEST_UNIFORM_Z (aba_11_s32_untied, svint32_t,
 		z0 = svaba_n_s32 (z1, z2, 11),
 		z0 = svaba (z1, z2, 11))
+
+/*
+** aba_11_s32_zeroop1n:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.s, #11
+**	sabd	z0\.s, \1/m, z0\.s, z1\.s
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_s32_zeroop1n, svint32_t,
+		z0 = svaba_n_s32 (svdup_s32 (0), z1, 11),
+		z0 = svaba (svdup_s32 (0), z1, 11))
+
+
+/*
+** aba_11_s32_zeroop1:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.s, #11
+**	sabd	z0\.s, \1/m, z0\.s, z1\.s
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_s32_zeroop1, svint32_t,
+		z0 = svaba_s32 (svdup_s32 (0), z1, svdup_s32 (11)),
+		z0 = svaba (svdup_s32 (0), z1, svdup_s32 (11)))
diff --git a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s64.c b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s64.c
index 0c169db..8b1eb7d 100644
--- a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s64.c
+++ b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_s64.c
@@ -108,3 +108,25 @@ TEST_UNIFORM_Z (aba_11_s64_tied2, svint64_t,
 TEST_UNIFORM_Z (aba_11_s64_untied, svint64_t,
 		z0 = svaba_n_s64 (z1, z2, 11),
 		z0 = svaba (z1, z2, 11))
+
+/*
+** aba_11_s64_zeroop1n:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.d, #11
+**	sabd	z0\.d, \1/m, z0\.d, z1\.d
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_s64_zeroop1n, svint64_t,
+		z0 = svaba_n_s64 (svdup_s64 (0), z1, 11),
+		z0 = svaba (svdup_s64 (0), z1, 11))
+
+/*
+** aba_11_s64_zeroop1:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.d, #11
+**	sabd	z0\.d, \1/m, z0\.d, z1\.d
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_s64_zeroop1, svint64_t,
+		z0 = svaba_s64 (svdup_s64 (0), z1, svdup_s64 (11)),
+		z0 = svaba (svdup_s64 (0), z1, svdup_s64 (11)))
diff --git a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u32.c b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u32.c
index 2ba8f41..fc2fed2 100644
--- a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u32.c
+++ b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u32.c
@@ -108,3 +108,25 @@ TEST_UNIFORM_Z (aba_11_u32_tied2, svuint32_t,
 TEST_UNIFORM_Z (aba_11_u32_untied, svuint32_t,
 		z0 = svaba_n_u32 (z1, z2, 11),
 		z0 = svaba (z1, z2, 11))
+
+/*
+** aba_11_u32_zeroop1n:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.s, #11
+**	uabd	z0\.s, \1/m, z0\.s, z1\.s
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_u32_zeroop1n, svuint32_t,
+		z0 = svaba_n_u32 (svdup_u32 (0), z1, 11),
+		z0 = svaba (svdup_u32 (0), z1, 11))
+
+/*
+** aba_11_u32_zeroop1:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.s, #11
+**	uabd	z0\.s, \1/m, z0\.s, z1\.s
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_u32_zeroop1, svuint32_t,
+		z0 = svaba_u32 (svdup_u32 (0), z1, svdup_u32 (11)),
+		z0 = svaba (svdup_u32 (0), z1, svdup_u32 (11)))
diff --git a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u64.c b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u64.c
index 8c6bef02..f6ed216 100644
--- a/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u64.c
+++ b/gcc/testsuite/gcc.target/aarch64/sve2/acle/asm/aba_u64.c
@@ -108,3 +108,25 @@ TEST_UNIFORM_Z (aba_11_u64_tied2, svuint64_t,
 TEST_UNIFORM_Z (aba_11_u64_untied, svuint64_t,
 		z0 = svaba_n_u64 (z1, z2, 11),
 		z0 = svaba (z1, z2, 11))
+
+/*
+** aba_11_u64_zeroop1n:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.d, #11
+**	uabd	z0\.d, \1/m, z0\.d, z1\.d
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_u64_zeroop1n, svuint64_t,
+		z0 = svaba_n_u64 (svdup_u64 (0), z1, 11),
+		z0 = svaba (svdup_u64 (0), z1, 11))
+
+/*
+** aba_11_u64_zeroop1:
+**	ptrue	(p[0-7])\.b, all
+**	mov	z0\.d, #11
+**	uabd	z0\.d, \1/m, z0\.d, z1\.d
+**	ret
+*/
+TEST_UNIFORM_Z (aba_11_u64_zeroop1, svuint64_t,
+		z0 = svaba_u64 (svdup_u64 (0), z1, svdup_u64 (11)),
+		z0 = svaba (svdup_u64 (0), z1, svdup_u64 (11)))