Constant fold shifts, turning this loop:
.LBB_Z5test0PdS__3: # no_exit.1
fldl data(,%eax,8)
fldl 24(%esp)
faddp %st(1)
fstl 24(%esp)
incl %eax
movl $16000, %ecx
sarl $3, %ecx
cmpl %eax, %ecx
fstpl 16(%esp)
#FP_REG_KILL
jg .LBB_Z5test0PdS__3 # no_exit.1
into:
.LBB_Z5test0PdS__3: # no_exit.1
fldl data(,%eax,8)
fldl 24(%esp)
faddp %st(1)
fstl 24(%esp)
incl %eax
cmpl $2000, %eax
fstpl 16(%esp)
#FP_REG_KILL
jl .LBB_Z5test0PdS__3 # no_exit.1
llvm-svn: 19427
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index f3c18d3..224b969 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -535,6 +535,9 @@
case ISD::AND : return getConstant(C1 & C2, VT);
case ISD::OR : return getConstant(C1 | C2, VT);
case ISD::XOR : return getConstant(C1 ^ C2, VT);
+ case ISD::SHL : return getConstant(C1 << (int)C2, VT);
+ case ISD::SRL : return getConstant(C1 >> (unsigned)C2, VT);
+ case ISD::SRA : return getConstant(N1C->getSignExtended() >>(int)C2, VT);
default: break;
}