[SDAG] Only apply sincos stack slot folding to IR pointers

Fixes #115323

Author: MacDue

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -2519,6 +2519,7 @@ bool SelectionDAG::expandMultipleResultFPLibCall(
     unsigned ResNo = StoreValue.getResNo();
     Type *StoreType = StoreValue.getValueType().getTypeForEVT(Ctx);
     if (CallRetResNo == ResNo || !ST->isSimple() ||
+        !isa<const Value *>(ST->getPointerInfo().V) ||
         ST->getAddressSpace() != 0 ||
         ST->getAlign() <
             getDataLayout().getABITypeAlign(StoreType->getScalarType()) ||

llvm/test/CodeGen/X86/sincos-stack-args.ll

@@ -0,0 +1,35 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --no_x86_scrub_sp --version 5
+; RUN: llc < %s -mtriple=i386-unknown-linux-gnu  | FileCheck %s
+; Test for issue https://github.com/llvm/llvm-project/issues/115323
+
+declare double @g(double, double)
+
+define double @f(double %a) {
+; CHECK-LABEL: f:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    subl $44, %esp
+; CHECK-NEXT:    .cfi_def_cfa_offset 48
+; CHECK-NEXT:    fldl 48(%esp)
+; CHECK-NEXT:    leal 24(%esp), %eax
+; CHECK-NEXT:    movl %eax, 12(%esp)
+; CHECK-NEXT:    leal 32(%esp), %eax
+; CHECK-NEXT:    movl %eax, 8(%esp)
+; CHECK-NEXT:    fstpl (%esp)
+; CHECK-NEXT:    calll sincos
+; CHECK-NEXT:    fldl 32(%esp)
+; CHECK-NEXT:    fldl 24(%esp)
+; CHECK-NEXT:    faddl {{\.?LCPI[0-9]+_[0-9]+}}
+; CHECK-NEXT:    fxch %st(1)
+; CHECK-NEXT:    fstpl 8(%esp)
+; CHECK-NEXT:    fstpl (%esp)
+; CHECK-NEXT:    calll g@PLT
+; CHECK-NEXT:    addl $44, %esp
+; CHECK-NEXT:    .cfi_def_cfa_offset 4
+; CHECK-NEXT:    retl
+entry:
+  %0 = tail call double @llvm.sin.f64(double %a)
+  %1 = tail call double @llvm.cos.f64(double %a)
+  %add = fadd double %1, 3.140000e+00
+  %call = tail call double @g(double %add, double %0)
+  ret double %call
+}