[PowerPC] Support extended sc mnemonic

A plain "sc" without argument is supposed to be treated like "sc 0"
by the assembler.  This patch adds a corresponding alias.

Problem reported by Joerg Sonnenberger.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183687 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index e5daafe072fd48efba3f5b76ae00fc3c09a72c7f..1b7ea93c45f7ee7177e6fb5e7f48295243e2060d 100644 (file)
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -2154,6 +2154,8 @@ class PPCAsmPseudo<string asm, dag iops>
   let isPseudo = 1;
 }
 
+def : InstAlias<"sc", (SC 0)>;
+
 def : InstAlias<"mr $rA, $rB", (OR8 g8rc:$rA, g8rc:$rB, g8rc:$rB)>;
 
 def SLWI : PPCAsmPseudo<"slwi $rA, $rS, $n",

diff --git a/test/MC/PowerPC/ppc64-encoding.s b/test/MC/PowerPC/ppc64-encoding.s
index a955f4f80706c7ef88ab3900b1d507593a3e0d92..d11ad4f61a14f8f7bc1416a2feb3f399e4374bac 100644 (file)
--- a/test/MC/PowerPC/ppc64-encoding.s
+++ b/test/MC/PowerPC/ppc64-encoding.s
@@ -43,6 +43,8 @@
 
 # CHECK: sc 1                            # encoding: [0x44,0x00,0x00,0x22]
          sc 1
+# CHECK: sc 0                            # encoding: [0x44,0x00,0x00,0x02]
+         sc
 
 # Fixed-point facility