[PowerPC] Support generic conditional branches in asm parser

This adds instruction patterns to cover the generic forms of
the conditional branch instructions.  This allows the assembler
to support the generic mnemonics.

The compiler will still generate the various specific forms
of the instruction that were already supported.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184722 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 41 insertions, 0 deletions

diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index dcea65c078..7934da9b3a 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -2229,6 +2229,47 @@ def SLDI : PPCAsmPseudo<"sldi $rA, $rS, $n",
 def SRDI : PPCAsmPseudo<"srdi $rA, $rS, $n",
                         (ins g8rc:$rA, g8rc:$rS, u6imm:$n)>;
 
+// These generic branch instruction forms are used for the assembler parser only.
+// Defs and Uses are conservative, since we don't know the BO value.
+let PPC970_Unit = 7 in {
+  let Defs = [CTR], Uses = [CTR, RM] in {
+    def gBC : BForm_3<16, 0, 0, (outs),
+                      (ins u5imm:$bo, crbitrc:$bi, condbrtarget:$dst),
+                      "bc $bo, $bi, $dst">;
+    def gBCA : BForm_3<16, 1, 0, (outs),
+                       (ins u5imm:$bo, crbitrc:$bi, abscondbrtarget:$dst),
+                       "bca $bo, $bi, $dst">;
+  }
+  let Defs = [LR, CTR], Uses = [CTR, RM] in {
+    def gBCL : BForm_3<16, 0, 1, (outs),
+                       (ins u5imm:$bo, crbitrc:$bi, condbrtarget:$dst),
+                       "bcl $bo, $bi, $dst">;
+    def gBCLA : BForm_3<16, 1, 1, (outs),
+                        (ins u5imm:$bo, crbitrc:$bi, abscondbrtarget:$dst),
+                        "bcla $bo, $bi, $dst">;
+  }
+  let Defs = [CTR], Uses = [CTR, LR, RM] in
+    def gBCLR : XLForm_2<19, 16, 0, (outs),
+                         (ins u5imm:$bo, crbitrc:$bi, i32imm:$bh),
+                         "bclr $bo, $bi, $bh", BrB, []>;
+  let Defs = [LR, CTR], Uses = [CTR, LR, RM] in
+    def gBCLRL : XLForm_2<19, 16, 1, (outs),
+                          (ins u5imm:$bo, crbitrc:$bi, i32imm:$bh),
+                          "bclrl $bo, $bi, $bh", BrB, []>;
+  let Defs = [CTR], Uses = [CTR, LR, RM] in
+    def gBCCTR : XLForm_2<19, 528, 0, (outs),
+                          (ins u5imm:$bo, crbitrc:$bi, i32imm:$bh),
+                          "bcctr $bo, $bi, $bh", BrB, []>;
+  let Defs = [LR, CTR], Uses = [CTR, LR, RM] in
+    def gBCCTRL : XLForm_2<19, 528, 1, (outs),
+                           (ins u5imm:$bo, crbitrc:$bi, i32imm:$bh),
+                           "bcctrl $bo, $bi, $bh", BrB, []>;
+}
+def : InstAlias<"bclr $bo, $bi", (gBCLR u5imm:$bo, crbitrc:$bi, 0)>;
+def : InstAlias<"bclrl $bo, $bi", (gBCLRL u5imm:$bo, crbitrc:$bi, 0)>;
+def : InstAlias<"bcctr $bo, $bi", (gBCCTR u5imm:$bo, crbitrc:$bi, 0)>;
+def : InstAlias<"bcctrl $bo, $bi", (gBCCTRL u5imm:$bo, crbitrc:$bi, 0)>;
+
 multiclass BranchExtendedMnemonic<string name, int bibo> {
   def : InstAlias<"b"#name#" $cc, $dst",
                   (BCC bibo, crrc:$cc, condbrtarget:$dst)>;