[gcc r12-2135] Generate 128-bit int divide/modulus on power10.

[Michael Meissner <meissner@gcc.gnu.org>]

https://gcc.gnu.org/g:852b11da11a181df517c0348df044354ff0656d6

commit r12-2135-g852b11da11a181df517c0348df044354ff0656d6
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Wed Jul 7 21:55:38 2021 -0400

    Generate 128-bit int divide/modulus on power10.
    
    This patch adds support for the VDIVSQ, VDIVUQ, VMODSQ, and VMODUQ
    instructions to do 128-bit arithmetic.
    
    2021-07-07  Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
            PR target/100809
            * config/rs6000/rs6000.md (udivti3): New insn.
            (divti3): New insn.
            (umodti3): New insn.
            (modti3): New insn.
    
    gcc/testsuite/
            PR target/100809
            * gcc.target/powerpc/p10-vdivq-vmodq.c: New test.

Diff:
---
 gcc/config/rs6000/rs6000.md                        | 34 ++++++++++++++++++++++
 gcc/testsuite/gcc.target/powerpc/p10-vdivq-vmodq.c | 27 +++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index e84d0311cc2..2368153269c 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -3234,6 +3234,14 @@
   [(set_attr "type" "div")
    (set_attr "size" "<bits>")])
 
+(define_insn "udivti3"
+  [(set (match_operand:TI 0 "altivec_register_operand" "=v")
+	(udiv:TI (match_operand:TI 1 "altivec_register_operand" "v")
+		 (match_operand:TI 2 "altivec_register_operand" "v")))]
+  "TARGET_POWER10 && TARGET_POWERPC64"
+  "vdivuq %0,%1,%2"
+  [(set_attr "type" "vecdiv")
+   (set_attr "size" "128")])
 
 ;; For powers of two we can do sra[wd]i/addze for divide and then adjust for
 ;; modulus.  If it isn't a power of two, force operands into register and do
@@ -3324,6 +3332,15 @@
    (set_attr "length" "8,12")
    (set_attr "cell_micro" "not")])
 
+(define_insn "divti3"
+  [(set (match_operand:TI 0 "altivec_register_operand" "=v")
+	(div:TI (match_operand:TI 1 "altivec_register_operand" "v")
+		(match_operand:TI 2 "altivec_register_operand" "v")))]
+  "TARGET_POWER10 && TARGET_POWERPC64"
+  "vdivsq %0,%1,%2"
+  [(set_attr "type" "vecdiv")
+   (set_attr "size" "128")])
+
 (define_expand "mod<mode>3"
   [(set (match_operand:GPR 0 "gpc_reg_operand")
 	(mod:GPR (match_operand:GPR 1 "gpc_reg_operand")
@@ -3424,6 +3441,23 @@
 	(minus:GPR (match_dup 1)
 		   (match_dup 3)))])
 
+(define_insn "umodti3"
+  [(set (match_operand:TI 0 "altivec_register_operand" "=v")
+	(umod:TI (match_operand:TI 1 "altivec_register_operand" "v")
+		 (match_operand:TI 2 "altivec_register_operand" "v")))]
+  "TARGET_POWER10 && TARGET_POWERPC64"
+  "vmoduq %0,%1,%2"
+  [(set_attr "type" "vecdiv")
+   (set_attr "size" "128")])
+
+(define_insn "modti3"
+  [(set (match_operand:TI 0 "altivec_register_operand" "=v")
+	(mod:TI (match_operand:TI 1 "altivec_register_operand" "v")
+		(match_operand:TI 2 "altivec_register_operand" "v")))]
+  "TARGET_POWER10 && TARGET_POWERPC64"
+  "vmodsq %0,%1,%2"
+  [(set_attr "type" "vecdiv")
+   (set_attr "size" "128")])
 \f
 ;; Logical instructions
 ;; The logical instructions are mostly combined by using match_operator,
diff --git a/gcc/testsuite/gcc.target/powerpc/p10-vdivq-vmodq.c b/gcc/testsuite/gcc.target/powerpc/p10-vdivq-vmodq.c
new file mode 100644
index 00000000000..84685e5ff43
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/p10-vdivq-vmodq.c
@@ -0,0 +1,27 @@
+/* { dg-require-effective-target int128 } */
+/* { dg-require-effective-target power10_ok } */
+/* { dg-options "-mdejagnu-cpu=power10 -O2" } */
+
+unsigned __int128 u_div(unsigned __int128 a, unsigned __int128 b)
+{
+   return a/b;
+}
+
+unsigned __int128 u_mod(unsigned __int128 a, unsigned __int128 b)
+{
+   return a%b;
+}
+__int128 s_div(__int128 a, __int128 b)
+{
+   return a/b;
+}
+
+__int128 s_mod(__int128 a, __int128 b)
+{
+   return a%b;
+}
+
+/* { dg-final { scan-assembler {\mvdivsq\M} } } */
+/* { dg-final { scan-assembler {\mvdivuq\M} } } */
+/* { dg-final { scan-assembler {\mvmodsq\M} } } */
+/* { dg-final { scan-assembler {\mvmoduq\M} } } */