[LoongArch] Offset folding for frameindex

This patch is for frameindex calculations.

Differential Revision: https://reviews.llvm.org/D130248

llvm/lib/Target/LoongArch/LoongArchInstrInfo.td

@@ -587,6 +587,12 @@ class PatGprImm_32<SDPatternOperator OpNode, LAInst Inst, Operand ImmOpnd>
     : Pat<(sext_inreg (OpNode GPR:$rj, ImmOpnd:$imm), i32),
           (Inst GPR:$rj, ImmOpnd:$imm)>;
 
+/// Predicates
+def AddLike: PatFrags<(ops node:$A, node:$B),
+                      [(add node:$A, node:$B), (or node:$A, node:$B)], [{
+    return N->getOpcode() == ISD::ADD || isOrEquivalentToAdd(N);
+}]>;
+
 /// Simple arithmetic operations
 
 // Match both a plain shift and one where the shift amount is masked (this is
@@ -654,6 +660,16 @@ def : PatGprImm<or, ORI, uimm12>;
 def : PatGprGpr<xor, XOR>;
 def : PatGprImm<xor, XORI, uimm12>;
 
+/// FrameIndex calculations
+let Predicates = [IsLA32] in {
+def : Pat<(AddLike (i32 BaseAddr:$rj), simm12:$imm12),
+          (ADDI_W (i32 BaseAddr:$rj), simm12:$imm12)>;
+} // Predicates = [IsLA32]
+let Predicates = [IsLA64] in {
+def : Pat<(AddLike (i64 BaseAddr:$rj), simm12:$imm12),
+          (ADDI_D (i64 BaseAddr:$rj), simm12:$imm12)>;
+} // Predicates = [IsLA64]
+
 /// Shift
 
 let Predicates = [IsLA32] in {
@@ -804,7 +820,7 @@ def : Pat<(loongarch_bstrpick GPR:$rj, uimm6:$msbd, uimm6:$lsbd),
 
 multiclass LdPat<PatFrag LoadOp, LAInst Inst, ValueType vt = GRLenVT> {
   def : Pat<(vt (LoadOp BaseAddr:$rj)), (Inst BaseAddr:$rj, 0)>;
-  def : Pat<(vt (LoadOp (add BaseAddr:$rj, simm12:$imm12))),
+  def : Pat<(vt (LoadOp (AddLike BaseAddr:$rj, simm12:$imm12))),
             (Inst BaseAddr:$rj, simm12:$imm12)>;
 }
 
@@ -828,7 +844,7 @@ multiclass StPat<PatFrag StoreOp, LAInst Inst, RegisterClass StTy,
                  ValueType vt> {
   def : Pat<(StoreOp (vt StTy:$rd), BaseAddr:$rj),
             (Inst StTy:$rd, BaseAddr:$rj, 0)>;
-  def : Pat<(StoreOp (vt StTy:$rd), (add BaseAddr:$rj, simm12:$imm12)),
+  def : Pat<(StoreOp (vt StTy:$rd), (AddLike BaseAddr:$rj, simm12:$imm12)),
             (Inst StTy:$rd, BaseAddr:$rj, simm12:$imm12)>;
 }
 

llvm/test/CodeGen/LoongArch/frame.ll

@@ -1,3 +1,4 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc --mtriple=loongarch64 < %s | FileCheck %s
 
 %struct.key_t = type { i32, [16 x i8] }
@@ -10,8 +11,7 @@ define i32 @test() nounwind {
 ; CHECK-NEXT:    st.w $zero, $sp, 16
 ; CHECK-NEXT:    st.d $zero, $sp, 8
 ; CHECK-NEXT:    st.d $zero, $sp, 0
-; CHECK-NEXT:    addi.d $a0, $sp, 0
-; CHECK-NEXT:    ori $a0, $a0, 4
+; CHECK-NEXT:    addi.d $a0, $sp, 4
 ; CHECK-NEXT:    bl test1
 ; CHECK-NEXT:    move $a0, $zero
 ; CHECK-NEXT:    ld.d $ra, $sp, 24 # 8-byte Folded Reload

llvm/test/CodeGen/LoongArch/ir-instruction/double-convert.ll

@@ -229,10 +229,8 @@ define double @convert_u32_to_double(i32 %a) nounwind {
 ; LA32-LABEL: convert_u32_to_double:
 ; LA32:       # %bb.0:
 ; LA32-NEXT:    addi.w $sp, $sp, -16
-; LA32-NEXT:    addi.w $a1, $sp, 8
-; LA32-NEXT:    ori $a1, $a1, 4
-; LA32-NEXT:    lu12i.w $a2, 275200
-; LA32-NEXT:    st.w $a2, $a1, 0
+; LA32-NEXT:    lu12i.w $a1, 275200
+; LA32-NEXT:    st.w $a1, $sp, 12
 ; LA32-NEXT:    st.w $a0, $sp, 8
 ; LA32-NEXT:    pcalau12i $a0, .LCPI12_0
 ; LA32-NEXT:    addi.w $a0, $a0, .LCPI12_0
@@ -292,9 +290,7 @@ define double @bitcast_i64_to_double(i64 %a, i64 %b) nounwind {
 ; LA32-LABEL: bitcast_i64_to_double:
 ; LA32:       # %bb.0:
 ; LA32-NEXT:    addi.w $sp, $sp, -16
-; LA32-NEXT:    addi.w $a2, $sp, 8
-; LA32-NEXT:    ori $a2, $a2, 4
-; LA32-NEXT:    st.w $a1, $a2, 0
+; LA32-NEXT:    st.w $a1, $sp, 12
 ; LA32-NEXT:    st.w $a0, $sp, 8
 ; LA32-NEXT:    fld.d $fa0, $sp, 8
 ; LA32-NEXT:    addi.w $sp, $sp, 16
@@ -313,10 +309,8 @@ define i64 @bitcast_double_to_i64(double %a) nounwind {
 ; LA32:       # %bb.0:
 ; LA32-NEXT:    addi.w $sp, $sp, -16
 ; LA32-NEXT:    fst.d $fa0, $sp, 8
-; LA32-NEXT:    addi.w $a0, $sp, 8
-; LA32-NEXT:    ori $a0, $a0, 4
-; LA32-NEXT:    ld.w $a1, $a0, 0
 ; LA32-NEXT:    ld.w $a0, $sp, 8
+; LA32-NEXT:    ld.w $a1, $sp, 12
 ; LA32-NEXT:    addi.w $sp, $sp, 16
 ; LA32-NEXT:    jirl $zero, $ra, 0
 ;

llvm/test/CodeGen/LoongArch/ir-instruction/float-convert.ll

@@ -500,10 +500,8 @@ define float @convert_u32_to_float(i32 %a) nounwind {
 ; LA32D-LABEL: convert_u32_to_float:
 ; LA32D:       # %bb.0:
 ; LA32D-NEXT:    addi.w $sp, $sp, -16
-; LA32D-NEXT:    addi.w $a1, $sp, 8
-; LA32D-NEXT:    ori $a1, $a1, 4
-; LA32D-NEXT:    lu12i.w $a2, 275200
-; LA32D-NEXT:    st.w $a2, $a1, 0
+; LA32D-NEXT:    lu12i.w $a1, 275200
+; LA32D-NEXT:    st.w $a1, $sp, 12
 ; LA32D-NEXT:    st.w $a0, $sp, 8
 ; LA32D-NEXT:    pcalau12i $a0, .LCPI14_0
 ; LA32D-NEXT:    addi.w $a0, $a0, .LCPI14_0