[PATCH] D79703: [PowerPC] Add an intrinsic for Popcntb

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Add the intrinsic llvm.ppc.popcntb for the instruction POPCNTB


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79703

Files:
  llvm/include/llvm/IR/IntrinsicsPowerPC.td
  llvm/lib/Target/PowerPC/PPCInstr64Bit.td
  llvm/test/CodeGen/PowerPC/popcnt.ll


Index: llvm/test/CodeGen/PowerPC/popcnt.ll
===================================================================
--- llvm/test/CodeGen/PowerPC/popcnt.ll
+++ llvm/test/CodeGen/PowerPC/popcnt.ll
@@ -4,6 +4,24 @@
 ; RUN: llc -verify-machineinstrs -mtriple=ppc64-- -mcpu=a2q < %s | FileCheck %s --check-prefix=SLOWPC
 ; RUN: llc -verify-machineinstrs -mtriple=ppc64-- -mcpu=a2q -mattr=+popcntd < %s | FileCheck %s
 
+define i64 @_cntb64(i64 %x) nounwind readnone {
+  %cnt = tail call i64 @llvm.ppc.popcntb(i64 %x)
+  ret i64 %cnt
+; CHECK-LABEL: @_cntb64
+; CHECK: popcntb
+; CHECK: blr
+}
+
+define i32 @_cntb32(i32 %x) nounwind readnone {
+  %y = zext i32 %x to i64
+  %cnt = tail call i64 @llvm.ppc.popcntb(i64 %y)
+  %res = trunc i64 %cnt to i32
+  ret i32 %res
+; CHECK-LABEL: @_cntb32
+; CHECK: popcntb
+; CHECK: blr
+}
+
 define i8 @cnt8(i8 %x) nounwind readnone {
   %cnt = tail call i8 @llvm.ctpop.i8(i8 %x)
   ret i8 %cnt
@@ -54,3 +72,4 @@
 declare i16 @llvm.ctpop.i16(i16) nounwind readnone
 declare i32 @llvm.ctpop.i32(i32) nounwind readnone
 declare i64 @llvm.ctpop.i64(i64) nounwind readnone
+declare i64 @llvm.ppc.popcntb(i64) nounwind readnone
Index: llvm/lib/Target/PowerPC/PPCInstr64Bit.td
===================================================================
--- llvm/lib/Target/PowerPC/PPCInstr64Bit.td
+++ llvm/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -786,8 +786,9 @@
                        "popcntw $rA, $rS", IIC_IntGeneral,
                        [(set i32:$rA, (ctpop i32:$rS))]>;
 
-def POPCNTB : XForm_11<31, 122, (outs gprc:$rA), (ins gprc:$rS),
-                       "popcntb $rA, $rS", IIC_IntGeneral, []>;
+def POPCNTB : XForm_11<31, 122, (outs g8rc:$rA), (ins g8rc:$rS),
+                       "popcntb $rA, $rS", IIC_IntGeneral,
+                       [(set i64:$rA, (int_ppc_popcntb i64:$rS))]>;
 
 defm DIVD  : XOForm_1rcr<31, 489, 0, (outs g8rc:$rT), (ins g8rc:$rA, g8rc:$rB),
                           "divd", "$rT, $rA, $rB", IIC_IntDivD,
Index: llvm/include/llvm/IR/IntrinsicsPowerPC.td
===================================================================
--- llvm/include/llvm/IR/IntrinsicsPowerPC.td
+++ llvm/include/llvm/IR/IntrinsicsPowerPC.td
@@ -31,6 +31,9 @@
   def int_ppc_dcbz  : Intrinsic<[], [llvm_ptr_ty], []>;
   def int_ppc_dcbzl : Intrinsic<[], [llvm_ptr_ty], []>;
 
+  // Population Count in each Byte.
+  def int_ppc_popcntb : Intrinsic<[llvm_i64_ty], [llvm_i64_ty], [IntrNoMem]>;
+
   // sync instruction (i.e. sync 0, a.k.a hwsync)
   def int_ppc_sync : Intrinsic<[], [], []>;
   // lwsync is sync 1


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