Add 64-bit to 32-bit trunc pattern.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143988 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index 05470d5a4d429af1a59bc9a8e1418f946a0c9f0a..3708c4a3627b4c34e93b9fb8a04816e3e2ec42e2 100644 (file)
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -172,3 +172,8 @@ defm : SetlePats<CPU64Regs, SLT64, SLTu64>;
 defm : SetgtPats<CPU64Regs, SLT64, SLTu64>;
 defm : SetgePats<CPU64Regs, SLT64, SLTu64>;
 defm : SetgeImmPats<CPU64Regs, SLTi64, SLTiu64>;
+
+// truncate
+def : Pat<(i32 (trunc CPU64Regs:$src)),
+          (SLL (EXTRACT_SUBREG CPU64Regs:$src, sub_32), 0)>, Requires<[IsN64]>;
+