From cdd2d6643f7fef40e335a7027edfea7276cde608 Mon Sep 17 00:00:00 2001
From: Kewen Lin <linkw@linux.ibm.com>
Date: Mon, 3 Apr 2023 21:47:44 -0500
Subject: rs6000: Fix vector parity support [PR108699]

The failures on the original failed case builtin-bitops-1.c
and the associated test case pr108699.c here show that the
current support of parity vector mode is wrong on Power.
The hardware insns vprtyb[wdq] which operate on the least
significant bit of each byte per element, they doesn't match
what RTL opcode parity needs, but the current implementation
expands it with them wrongly.

This patch is to fix the handling with one more insn vpopcntb.

	PR target/108699

gcc/ChangeLog:

	* config/rs6000/altivec.md (*p9v_parity<mode>2): Rename to ...
	(rs6000_vprtyb<mode>2): ... this.
	* config/rs6000/rs6000-builtins.def (VPRTYBD): Replace parityv2di2 with
	rs6000_vprtybv2di2.
	(VPRTYBW): Replace parityv4si2 with rs6000_vprtybv4si2.
	(VPRTYBQ): Replace parityv1ti2 with rs6000_vprtybv1ti2.
	* config/rs6000/vector.md (parity<mode>2 with VEC_IP): Expand with
	popcountv16qi2 and the corresponding rs6000_vprtyb<mode>2.

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/p9-vparity.c: Add scan-assembler-not for vpopcntb
	to distinguish parity byte from parity.
	* gcc.target/powerpc/pr108699.c: New test.
---
 gcc/config/rs6000/altivec.md                  |  8 +++--
 gcc/config/rs6000/rs6000-builtins.def         |  6 ++--
 gcc/config/rs6000/vector.md                   | 11 ++++++-
 gcc/testsuite/gcc.target/powerpc/p9-vparity.c |  1 +
 gcc/testsuite/gcc.target/powerpc/pr108699.c   | 42 +++++++++++++++++++++++++++
 5 files changed, 61 insertions(+), 7 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/powerpc/pr108699.c

(limited to 'gcc')

diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index 30606b8..49b0c96 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -4195,9 +4195,11 @@
   [(set_attr "type" "vecsimple")])
 
 ;; Vector parity
-(define_insn "*p9v_parity<mode>2"
-  [(set (match_operand:VParity 0 "register_operand" "=v")
-        (parity:VParity (match_operand:VParity 1 "register_operand" "v")))]
+(define_insn "rs6000_vprtyb<mode>2"
+  [(set (match_operand:VEC_IP 0 "register_operand" "=v")
+        (unspec:VEC_IP
+          [(match_operand:VEC_IP 1 "register_operand" "v")]
+          UNSPEC_PARITY))]
   "TARGET_P9_VECTOR"
   "vprtyb<wd> %0,%1"
   [(set_attr "type" "vecsimple")])
diff --git a/gcc/config/rs6000/rs6000-builtins.def b/gcc/config/rs6000/rs6000-builtins.def
index e0d9f5a..03fb194 100644
--- a/gcc/config/rs6000/rs6000-builtins.def
+++ b/gcc/config/rs6000/rs6000-builtins.def
@@ -2666,13 +2666,13 @@
     VMSUMUDM altivec_vmsumudm {}
 
   const vsll __builtin_altivec_vprtybd (vsll);
-    VPRTYBD parityv2di2 {}
+    VPRTYBD rs6000_vprtybv2di2 {}
 
   const vsq __builtin_altivec_vprtybq (vsq);
-    VPRTYBQ parityv1ti2 {}
+    VPRTYBQ rs6000_vprtybv1ti2 {}
 
   const vsi __builtin_altivec_vprtybw (vsi);
-    VPRTYBW parityv4si2 {}
+    VPRTYBW rs6000_vprtybv4si2 {}
 
   const vsll __builtin_altivec_vrldmi (vsll, vsll, vsll);
     VRLDMI altivec_vrldmi {}
diff --git a/gcc/config/rs6000/vector.md b/gcc/config/rs6000/vector.md
index 12fd5f9..1ae04c8 100644
--- a/gcc/config/rs6000/vector.md
+++ b/gcc/config/rs6000/vector.md
@@ -1226,7 +1226,16 @@
 (define_expand "parity<mode>2"
   [(set (match_operand:VEC_IP 0 "register_operand")
 	(parity:VEC_IP (match_operand:VEC_IP 1 "register_operand")))]
-  "TARGET_P9_VECTOR")
+  "TARGET_P9_VECTOR"
+{
+  rtx op1 = gen_lowpart (V16QImode, operands[1]);
+  rtx res = gen_reg_rtx (V16QImode);
+  emit_insn (gen_popcountv16qi2 (res, op1));
+  emit_insn (gen_rs6000_vprtyb<mode>2 (operands[0],
+				       gen_lowpart (<MODE>mode, res)));
+
+  DONE;
+})
 
 
 ;; Same size conversions
diff --git a/gcc/testsuite/gcc.target/powerpc/p9-vparity.c b/gcc/testsuite/gcc.target/powerpc/p9-vparity.c
index f4aba15..8f6f123 100644
--- a/gcc/testsuite/gcc.target/powerpc/p9-vparity.c
+++ b/gcc/testsuite/gcc.target/powerpc/p9-vparity.c
@@ -105,3 +105,4 @@ parity_ti_4u (__uint128_t a)
 /* { dg-final { scan-assembler "vprtybd" } } */
 /* { dg-final { scan-assembler "vprtybq" } } */
 /* { dg-final { scan-assembler "vprtybw" } } */
+/* { dg-final { scan-assembler-not "vpopcntb" } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/pr108699.c b/gcc/testsuite/gcc.target/powerpc/pr108699.c
new file mode 100644
index 0000000..f02bac1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr108699.c
@@ -0,0 +1,42 @@
+/* { dg-run } */
+/* { dg-options "-O2 -ftree-vectorize -fno-vect-cost-model" } */
+
+#define N 16
+
+unsigned long long vals[N];
+unsigned int res[N];
+unsigned int expects[N] = {0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+unsigned long long inputs[N]
+  = {0x0000000000000000ULL, 0x0000000000000001ULL, 0x8000000000000000ULL,
+     0x0000000000000002ULL, 0x4000000000000000ULL, 0x0000000100000000ULL,
+     0x0000000080000000ULL, 0xa5a5a5a5a5a5a5a5ULL, 0x5a5a5a5a5a5a5a5aULL,
+     0xcafecafe00000000ULL, 0x0000cafecafe0000ULL, 0x00000000cafecafeULL,
+     0x8070600000000000ULL, 0xffffffffffffffffULL};
+
+__attribute__ ((noipa)) void
+init ()
+{
+  for (int i = 0; i < N; i++)
+    vals[i] = inputs[i];
+}
+
+__attribute__ ((noipa)) void
+do_parity ()
+{
+  for (int i = 0; i < N; i++)
+    res[i] = __builtin_parityll (vals[i]);
+}
+
+int
+main (void)
+{
+  init ();
+  do_parity ();
+  for (int i = 0; i < N; i++)
+    if (res[i] != expects[i])
+      __builtin_abort();
+
+  return 0;
+}
+
-- 
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