[llvm] r215240 - Allow large immediates for branch instructions in 32bit mode.

[Joerg Sonnenberger]

Author: joerg
Date: Fri Aug  8 15:57:58 2014
New Revision: 215240

URL: http://llvm.org/viewvc/llvm-project?rev=215240&view=rev
Log:
Allow large immediates for branch instructions in 32bit mode.

Added:
    llvm/trunk/test/MC/PowerPC/ppc32-ba.s
Modified:
    llvm/trunk/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp

Modified: llvm/trunk/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp?rev=215240&r1=215239&r2=215240&view=diff
==============================================================================
--- llvm/trunk/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp (original)
+++ llvm/trunk/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp Fri Aug  8 15:57:58 2014
@@ -432,9 +432,23 @@ public:
   bool isS17Imm() const { return Kind == Expression ||
                                  (Kind == Immediate && isInt<17>(getImm())); }
   bool isTLSReg() const { return Kind == TLSRegister; }
-  bool isDirectBr() const { return Kind == Expression ||
-                                   (Kind == Immediate && isInt<26>(getImm()) &&
-                                    (getImm() & 3) == 0); }
+  bool isDirectBr() const {
+    if (Kind == Expression)
+      return true;
+    if (Kind != Immediate)
+      return false;
+    // Operand must be 64-bit aligned, signed 27-bit immediate.
+    if ((getImm() & 3) != 0)
+      return false;
+    if (isInt<26>(getImm()))
+      return true;
+    if (!IsPPC64) {
+      // In 32-bit mode, large 32-bit quantities wrap around.
+      if (isUInt<32>(getImm()) && isInt<26>(static_cast<int32_t>(getImm())))
+        return true;
+    }
+    return false;
+  }
   bool isCondBr() const { return Kind == Expression ||
                                  (Kind == Immediate && isInt<16>(getImm()) &&
                                   (getImm() & 3) == 0); }

Added: llvm/trunk/test/MC/PowerPC/ppc32-ba.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/PowerPC/ppc32-ba.s?rev=215240&view=auto
==============================================================================
--- llvm/trunk/test/MC/PowerPC/ppc32-ba.s (added)
+++ llvm/trunk/test/MC/PowerPC/ppc32-ba.s Fri Aug  8 15:57:58 2014
@@ -0,0 +1,6 @@
+# RUN: llvm-mc -triple powerpc-unknown-unknown --show-encoding %s | FileCheck %s
+
+# Check that large immediates in 32bit mode are accepted.
+
+# CHECK: ba -33554432 # encoding: [0x4a,0x00,0x00,0x02]
+         ba 0xfe000000