[PowerPC][Altivec] Add mfvrd and mffprd extended mnemonic

mfvrd and mffprd are both alias to mfvrsd.
This patch enables correct parsing of the aliases, but we still emit a mfvrsd.

Committing on behalf of brunoalr (Bruno Rosa).

Differential Revision: https://reviews.llvm.org/D29177

llvm-svn: 297849

llvm/lib/Target/PowerPC/PPCInstrVSX.td

@@ -1410,6 +1410,11 @@ let Predicates = [HasDirectMove] in {
                               "mfvsrd $rA, $XT", IIC_VecGeneral,
                               [(set i64:$rA, (PPCmfvsr f64:$XT))]>,
       Requires<[In64BitMode]>;
+  let isCodeGenOnly = 1 in
+  def MFVRD : XX1_RS6_RD5_XO<31, 51, (outs g8rc:$rA), (ins vrrc:$XT),
+                             "mfvsrd $rA, $XT", IIC_VecGeneral,
+                             []>,
+      Requires<[In64BitMode]>;
   def MFVSRWZ : XX1_RS6_RD5_XO<31, 115, (outs gprc:$rA), (ins vsfrc:$XT),
                                "mfvsrwz $rA, $XT", IIC_VecGeneral,
                                [(set i32:$rA, (PPCmfvsr f64:$XT))]>;
@@ -1440,6 +1445,13 @@ let Predicates = [IsISA3_0, HasDirectMove] in {
 } // IsISA3_0, HasDirectMove
 } // UseVSXReg = 1
 
+// We want to parse this from asm, but we don't want to emit this as it would
+// be emitted with a VSX reg. So leave Emit = 0 here.
+def : InstAlias<"mfvrd $rA, $XT",
+                (MFVRD g8rc:$rA, vrrc:$XT), 0>;
+def : InstAlias<"mffprd $rA, $src",
+                (MFVSRD g8rc:$rA, f8rc:$src)>;
+
 /*  Direct moves of various widths from GPR's into VSR's. Each move lines
     the value up into element 0 (both BE and LE). Namely, entities smaller than
     a doubleword are shifted left and moved for BE. For LE, they're moved, then

llvm/test/CodeGen/PowerPC/bitcasts-direct-move.ll

@@ -20,7 +20,7 @@ entry:
   ret i64 %0
 ; CHECK-P7: stxsdx 1,
 ; CHECK-P7: ld 3,
-; CHECK: mfvsrd 3, 1
+; CHECK: mffprd 3, 1
 }
 
 define float @i32tof32(i32 signext %a) {
@@ -60,7 +60,7 @@ entry:
   ret i64 %0
 ; CHECK-P7: stxsdx 1,
 ; CHECK-P7: ld 3,
-; CHECK: mfvsrd 3, 1
+; CHECK: mffprd 3, 1
 }
 
 define float @i32utof32(i32 zeroext %a) {

llvm/test/CodeGen/PowerPC/fp-int-conversions-direct-moves.ll

@@ -323,7 +323,7 @@ entry:
   ret i64 %conv
 ; CHECK-LABEL: @_Z7testllff
 ; CHECK: xscvdpsxds [[CONVREG13:[0-9]+]], 1
-; CHECK: mfvsrd 3, [[CONVREG13]]
+; CHECK: mffprd 3, [[CONVREG13]]
 }
 
 ; Function Attrs: nounwind
@@ -349,7 +349,7 @@ entry:
   ret i64 %conv
 ; CHECK-LABEL: @_Z7testlldd
 ; CHECK: xscvdpsxds [[CONVREG14:[0-9]+]], 1
-; CHECK: mfvsrd 3, [[CONVREG14]]
+; CHECK: mffprd 3, [[CONVREG14]]
 }
 
 ; Function Attrs: nounwind
@@ -375,7 +375,7 @@ entry:
   ret i64 %conv
 ; CHECK-LABEL: @_Z8testullff
 ; CHECK: xscvdpuxds [[CONVREG15:[0-9]+]], 1
-; CHECK: mfvsrd 3, [[CONVREG15]]
+; CHECK: mffprd 3, [[CONVREG15]]
 }
 
 ; Function Attrs: nounwind
@@ -401,7 +401,7 @@ entry:
   ret i64 %conv
 ; CHECK-LABEL: @_Z8testulldd
 ; CHECK: xscvdpuxds [[CONVREG16:[0-9]+]], 1
-; CHECK: mfvsrd 3, [[CONVREG16]]
+; CHECK: mffprd 3, [[CONVREG16]]
 }
 
 ; Function Attrs: nounwind

llvm/test/CodeGen/PowerPC/fp128-bitcast-after-operation.ll

@@ -19,8 +19,8 @@ entry:
 ; PPC64: blr
 
 ; PPC64-P8-LABEL: test_abs:
-; PPC64-P8-DAG: mfvsrd [[LO:[0-9]+]], 2
-; PPC64-P8-DAG: mfvsrd [[HI:[0-9]+]], 1
+; PPC64-P8-DAG: mffprd [[LO:[0-9]+]], 2
+; PPC64-P8-DAG: mffprd [[HI:[0-9]+]], 1
 ; PPC64-P8-DAG: rldicr [[FLIP_BIT:[0-9]+]], [[HI]], 0, 0
 ; PPC64-P8-DAG: xor 3, [[HI]], [[FLIP_BIT]]
 ; PPC64-P8-DAG: xor 4, [[LO]], [[FLIP_BIT]]
@@ -59,8 +59,8 @@ entry:
 ; PPC64: blr
 
 ; PPC64-P8-LABEL: test_neg:
-; PPC64-P8-DAG: mfvsrd [[LO:[0-9]+]], 2
-; PPC64-P8-DAG: mfvsrd [[HI:[0-9]+]], 1
+; PPC64-P8-DAG: mffprd [[LO:[0-9]+]], 2
+; PPC64-P8-DAG: mffprd [[HI:[0-9]+]], 1
 ; PPC64-P8-DAG: li [[IMM1:[0-9]+]], 1
 ; PPC64-P8-DAG: sldi [[FLIP_BIT:[0-9]+]], [[IMM1]], 63
 ; PPC64-P8-NOT: BARRIER
@@ -101,7 +101,7 @@ entry:
 ; PPC64: blr
 
 ; PPC64-P8-LABEL: test_copysign:
-; PPC64-P8-DAG: mfvsrd [[X_HI:[0-9]+]], 1
+; PPC64-P8-DAG: mffprd [[X_HI:[0-9]+]], 1
 ; PPC64-P8-DAG: li [[HI_TMP:[0-9]+]], 16399
 ; PPC64-P8-DAG: sldi [[CST_HI:[0-9]+]], [[HI_TMP]], 48
 ; PPC64-P8-DAG: li [[LO_TMP:[0-9]+]], 3019