[nfc] Add regression test for large offsets in X86 ISel

Author: wesleywiser

llvm/test/CodeGen/X86/dag-large-offset.ll

@@ -0,0 +1,34 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=i386-pc-windows-msvc | FileCheck %s
+
+define dso_local noundef i32 @foo(i1 %b) local_unnamed_addr #0 {
+; CHECK-LABEL: foo:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pushl %ebp
+; CHECK-NEXT:    movl %esp, %ebp
+; CHECK-NEXT:    pushl %esi
+; CHECK-NEXT:    subl $8, %esp
+; CHECK-NEXT:    movl ___security_cookie, %eax
+; CHECK-NEXT:    xorl %ebp, %eax
+; CHECK-NEXT:    movl %eax, -8(%ebp)
+; CHECK-NEXT:    leal 2147483640(%ebp), %eax
+; CHECK-NEXT:    xorl %esi, %esi
+; CHECK-NEXT:    testb $1, 8(%ebp)
+; CHECK-NEXT:    cmovnel %eax, %esi
+; CHECK-NEXT:    movl -8(%ebp), %ecx
+; CHECK-NEXT:    xorl %ebp, %ecx
+; CHECK-NEXT:    calll @__security_check_cookie@4
+; CHECK-NEXT:    movl %esi, %eax
+; CHECK-NEXT:    addl $8, %esp
+; CHECK-NEXT:    popl %esi
+; CHECK-NEXT:    popl %ebp
+; CHECK-NEXT:    retl
+entry:
+  %a = alloca i8, align 1
+  %0 = ptrtoint ptr %a to i32
+  %sub = add i32 %0, -2147483647
+  %retval.0 = select i1 %b, i32 %sub, i32 0
+  ret i32 %retval.0
+}
+
+attributes #0 = { mustprogress nofree norecurse nosync nounwind sspreq willreturn memory(none) "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }