[llvm] r236273 - [AArch64] Fix bad register class constraint in fast-isel for TST instruction.

[Quentin Colombet]

Author: qcolombet
Date: Thu Apr 30 17:27:20 2015
New Revision: 236273

URL: http://llvm.org/viewvc/llvm-project?rev=236273&view=rev
Log:
[AArch64] Fix bad register class constraint in fast-isel for TST instruction.

rdar://problem/20748715

Modified:
    llvm/trunk/lib/Target/AArch64/AArch64FastISel.cpp
    llvm/trunk/test/CodeGen/AArch64/arm64-fast-isel.ll

Modified: llvm/trunk/lib/Target/AArch64/AArch64FastISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64FastISel.cpp?rev=236273&r1=236272&r2=236273&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64FastISel.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64FastISel.cpp Thu Apr 30 17:27:20 2015
@@ -2679,8 +2679,11 @@ bool AArch64FastISel::selectSelect(const
       return false;
     bool CondIsKill = hasTrivialKill(Cond);
 
+    const MCInstrDesc &II = TII.get(AArch64::ANDSWri);
+    CondReg = constrainOperandRegClass(II, CondReg, 1);
+
     // Emit a TST instruction (ANDS wzr, reg, #imm).
-    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ANDSWri),
+    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II,
             AArch64::WZR)
         .addReg(CondReg, getKillRegState(CondIsKill))
         .addImm(AArch64_AM::encodeLogicalImmediate(1, 32));

Modified: llvm/trunk/test/CodeGen/AArch64/arm64-fast-isel.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/arm64-fast-isel.ll?rev=236273&r1=236272&r2=236273&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/arm64-fast-isel.ll (original)
+++ llvm/trunk/test/CodeGen/AArch64/arm64-fast-isel.ll Thu Apr 30 17:27:20 2015
@@ -91,3 +91,13 @@ define void @t6() nounwind {
 }
 
 declare void @llvm.trap() nounwind
+
+define void @ands(i32* %addr) {
+; CHECK-LABEL: ands:
+; CHECK: tst [[COND:w[0-9]+]], #0x1
+; CHECK-NEXT: csel [[COND]],
+entry:
+  %cond91 = select i1 undef, i32 1, i32 2
+  store i32 %cond91, i32* %addr, align 4
+  ret void
+}