[Xtensa] Fix lowering immediate.

Author: andreisfr

llvm/lib/Target/Xtensa/XtensaISelLowering.cpp

@@ -892,7 +892,7 @@ SDValue XtensaTargetLowering::LowerImmediate(SDValue Op,
     // Check if use node maybe lowered to the ADDMI instruction
     SDNode &OpNode = *Op.getNode();
     if ((OpNode.hasOneUse() && OpNode.user_begin()->getOpcode() == ISD::ADD) &&
-        isShiftedInt<16, 8>(Value))
+        isShiftedInt<8, 8>(Value))
       return Op;
     Type *Ty = Type::getInt32Ty(*DAG.getContext());
     Constant *CV = ConstantInt::get(Ty, Value);

llvm/test/CodeGen/Xtensa/add_shifted_imm.ll

@@ -0,0 +1,53 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=xtensa -verify-machineinstrs < %s \
+; RUN:   | FileCheck %s
+
+define i64 @test_1(i32 %v) {
+; CHECK-LABEL: test_1:
+; CHECK:         .cfi_startproc
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    l32r a8, .LCPI0_0
+; CHECK-NEXT:    add a2, a2, a8
+; CHECK-NEXT:    movi a3, 0
+; CHECK-NEXT:    ret
+  %addres = add i32 %v, -65536
+  %res = zext i32 %addres to i64
+  ret i64 %res
+}
+
+define i64 @test_2(i32 %v) {
+; CHECK-LABEL: test_2:
+; CHECK:         .cfi_startproc
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    l32r a8, .LCPI1_0
+; CHECK-NEXT:    add a2, a2, a8
+; CHECK-NEXT:    movi a3, 0
+; CHECK-NEXT:    ret
+  %addres = add i32 %v, 65536
+  %res = zext i32 %addres to i64
+  ret i64 %res
+}
+
+define i64 @test_3(i32 %v) {
+; CHECK-LABEL: test_3:
+; CHECK:         .cfi_startproc
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    addmi a2, a2, -32768
+; CHECK-NEXT:    movi a3, 0
+; CHECK-NEXT:    ret
+  %addres = add i32 %v, -32768
+  %res = zext i32 %addres to i64
+  ret i64 %res
+}
+
+define i64 @test_4(i32 %v) {
+; CHECK-LABEL: test_4:
+; CHECK:         .cfi_startproc
+; CHECK-NEXT:  # %bb.0:
+; CHECK-NEXT:    addmi a2, a2, 32512
+; CHECK-NEXT:    movi a3, 0
+; CHECK-NEXT:    ret
+  %addres = add i32 %v, 32512
+  %res = zext i32 %addres to i64
+  ret i64 %res
+}