[PowerPC] Don't assume ADDISdtprelHA's source is r3

Even through ADDISdtprelHA generally has r3 as its source register, it is
possible for the instruction scheduler to move things around such that some
other register is the source. We need to print the actual source register, not
always r3. Fixes PR24394.

The test case will come in a follow-up commit because it depends on MIR
target-flags parsing.

llvm-svn: 246372

1 files changed, 5 insertions, 5 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
index 2ce7501d020..a779338408e 100644
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -947,11 +947,11 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     return;
   }
   case PPC::ADDISdtprelHA:
-    // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
-    // Into:      %Xd = ADDIS8 %X3, sym@dtprel@ha
+    // Transform: %Xd = ADDISdtprelHA %Xs, <ga:@sym>
+    // Into:      %Xd = ADDIS8 %Xs, sym@dtprel@ha
   case PPC::ADDISdtprelHA32: {
-    // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
-    // Into:      %Rd = ADDIS %R3, sym@dtprel@ha
+    // Transform: %Rd = ADDISdtprelHA32 %Rs, <ga:@sym>
+    // Into:      %Rd = ADDIS %Rs, sym@dtprel@ha
     const MachineOperand &MO = MI->getOperand(2);
     const GlobalValue *GValue = MO.getGlobal();
     MCSymbol *MOSymbol = getSymbol(GValue);
@@ -962,7 +962,7 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
         *OutStreamer,
         MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
             .addReg(MI->getOperand(0).getReg())
-            .addReg(Subtarget->isPPC64() ? PPC::X3 : PPC::R3)
+            .addReg(MI->getOperand(1).getReg())
             .addExpr(SymDtprel));
     return;
   }