[X86] Add test cases for gnux32 large constants Issue #55061

Test file showing current codegen for D124406

Author: RKSimon

llvm/test/CodeGen/X86/large-constants-x32.ll

@@ -0,0 +1,47 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-linux-gnux32 | FileCheck %s
+
+define void @constant_expressions() {
+; CHECK-LABEL: constant_expressions:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl -289477652, %eax
+; CHECK-NEXT:    movl -289477644, %ecx
+; CHECK-NEXT:    addl -289477648, %eax
+; CHECK-NEXT:    addl -289477636, %ecx
+; CHECK-NEXT:    addl %eax, %ecx
+; CHECK-NEXT:    movl %ecx, -289477652
+; CHECK-NEXT:    retq
+entry:
+  %0 = load i32, i32* inttoptr (i32 add (i32 -289477652, i32 0) to i32*)
+  %1 = load i32, i32* inttoptr (i32 add (i32 -289477652, i32 4) to i32*)
+  %2 = load i32, i32* inttoptr (i32 add (i32 -289477652, i32 8) to i32*)
+  %3 = load i32, i32* inttoptr (i32 add (i32 -289477652, i32 16) to i32*)
+  %4 = add i32 %0, %1
+  %5 = add i32 %2, %3
+  %6 = add i32 %4, %5
+  store i32 %6, i32* inttoptr (i32 add (i32 -289477652, i32 0) to i32*)
+  ret void
+}
+
+
+define void @constant_expressions2() {
+; CHECK-LABEL: constant_expressions2:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movl -289477652, %eax
+; CHECK-NEXT:    movl -289477644, %ecx
+; CHECK-NEXT:    addl -289477648, %eax
+; CHECK-NEXT:    addl -289477640, %ecx
+; CHECK-NEXT:    addl %eax, %ecx
+; CHECK-NEXT:    movl %ecx, -289477652
+; CHECK-NEXT:    retq
+entry:
+  %0 = load i32, i32* inttoptr (i32 -289477652 to i32*)
+  %1 = load i32, i32* inttoptr (i32 -289477648 to i32*)
+  %2 = load i32, i32* inttoptr (i32 -289477644 to i32*)
+  %3 = load i32, i32* inttoptr (i32 -289477640 to i32*)
+  %4 = add i32 %0, %1
+  %5 = add i32 %2, %3
+  %6 = add i32 %4, %5
+  store i32 %6, i32* inttoptr (i32 -289477652 to i32*)
+  ret void
+}