[mips] Set flag isAsCheapAsAMove flag on instruction LUi.

llvm-svn: 167345

2 files changed, 26 insertions, 1 deletions

diff --git a/llvm/lib/Target/Mips/MipsInstrInfo.td b/llvm/lib/Target/Mips/MipsInstrInfo.td
index 3f6cebdc18d..3319553935e 100644
--- a/llvm/lib/Target/Mips/MipsInstrInfo.td
+++ b/llvm/lib/Target/Mips/MipsInstrInfo.td
@@ -421,7 +421,7 @@ class shift_rotate_reg<bits<6> func, bits<5> isRotate, string instr_asm,
 // Load Upper Imediate
 class LoadUpper<bits<6> op, string instr_asm, RegisterClass RC, Operand Imm>:
   FI<op, (outs RC:$rt), (ins Imm:$imm16),
-     !strconcat(instr_asm, "\t$rt, $imm16"), [], IIAlu> {
+     !strconcat(instr_asm, "\t$rt, $imm16"), [], IIAlu>, IsAsCheapAsAMove {
   let rs = 0;
   let neverHasSideEffects = 1;
   let isReMaterializable = 1;
diff --git a/llvm/test/CodeGen/Mips/remat-immed-load.ll b/llvm/test/CodeGen/Mips/remat-immed-load.ll
index e4548f8ce29..d93964bcaef 100644
--- a/llvm/test/CodeGen/Mips/remat-immed-load.ll
+++ b/llvm/test/CodeGen/Mips/remat-immed-load.ll
@@ -24,3 +24,28 @@ entry:
 }
 
 declare void @foo2(i64)
+
+define void @f5() nounwind {
+entry:
+; 32:  lui $4, 1
+; 32:  lui $4, 1
+
+  tail call void @f6(i32 65536) nounwind
+  tail call void @f6(i32 65536) nounwind
+  ret void
+}
+
+declare void @f6(i32)
+
+define void @f7() nounwind {
+entry:
+; 64:  lui $4, 1
+; 64:  lui $4, 1
+
+  tail call void @f8(i64 65536) nounwind
+  tail call void @f8(i64 65536) nounwind
+  ret void
+}
+
+declare void @f8(i64)
+