Add 64-bit to 32-bit trunc pattern.

llvm-svn: 143988
2011-11-07 18:57:41 +00:00 · 2011-11-07 18:57:41 +00:00 · d5c1329078
parent 80357c6227
commit d5c1329078
1 changed files with 5 additions and 0 deletions
--- a/llvm/lib/Target/Mips/Mips64InstrInfo.td
+++ b/llvm/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]>;
+