From: Douglas Katzman <dougk@google.com>
Date: Wed, 19 Aug 2015 19:30:57 +0000 (+0000)
Subject: [Sparc]: asm-only support for the ldstub instruction.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=73e587e7f990867e31604f93b04913c7bf0fabc8;p=oota-llvm.git

[Sparc]: asm-only support for the ldstub instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245485 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/Sparc/SparcInstrInfo.td b/lib/Target/Sparc/SparcInstrInfo.td
index 21e9f70e4db..5da4983eab4 100644
--- a/lib/Target/Sparc/SparcInstrInfo.td
+++ b/lib/Target/Sparc/SparcInstrInfo.td
@@ -298,6 +298,17 @@ multiclass LoadA<string OpcStr, bits<6> Op3Val, bits<6> LoadAOp3Val,
   def Arr  : LoadASI<OpcStr, LoadAOp3Val, OpNode, RC, Ty>;
 }
 
+// The LDSTUB instruction is supported for asm only.
+// It is unlikely that general-purpose code could make use of it.
+// CAS is preferred for sparc v9.
+def LDSTUBrr : F3_1<3, 0b001101, (outs IntRegs:$dst), (ins MEMrr:$addr),
+                  "ldstub [$addr], $dst", []>;
+def LDSTUBri : F3_2<3, 0b001101, (outs IntRegs:$dst), (ins MEMri:$addr),
+                  "ldstub [$addr], $dst", []>;
+def LDSTUBArr : F3_1_asi<3, 0b011101, (outs IntRegs:$dst),
+                         (ins MEMrr:$addr, i8imm:$asi),
+                         "ldstuba [$addr] $asi, $dst", []>;
+
 // Store multiclass - Define both Reg+Reg/Reg+Imm patterns in one shot.
 multiclass Store<string OpcStr, bits<6> Op3Val, SDPatternOperator OpNode,
            RegisterClass RC, ValueType Ty> {
diff --git a/test/MC/Sparc/sparc-atomic-instructions.s b/test/MC/Sparc/sparc-atomic-instructions.s
index 17f97d4b535..4ce19d5cdda 100644
--- a/test/MC/Sparc/sparc-atomic-instructions.s
+++ b/test/MC/Sparc/sparc-atomic-instructions.s
@@ -12,3 +12,12 @@
 
         ! CHECK: swapa [%i0+%l6] 131, %o2   ! encoding: [0xd4,0xfe,0x10,0x76]
         swapa [%i0+%l6] 131, %o2
+
+        ! CHECK: ldstub [%i0+40], %g1 ! encoding: [0xc2,0x6e,0x20,0x28]
+        ldstub [%i0+40], %g1
+
+        ! CHECK: ldstub [%i0+%i2], %g1 ! encoding: [0xc2,0x6e,0x00,0x1a]
+        ldstub [%i0+%i2], %g1
+
+        ! CHECK: ldstuba [%i0+%i2] 131, %g1 ! encoding: [0xc2,0xee,0x10,0x7a]
+        ldstuba [%i0+%i2] 131, %g1