[InstSimplify] Add test for ptr diff without inbounds (NFC)

Also regenerate the test in current format.

Author: nikic

llvm/test/Transforms/InstSimplify/ptr_diff.ll

@@ -1,11 +1,11 @@
-; NOTE: Assertions have been autogenerated by update_test_checks.py
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -passes=instsimplify -S | FileCheck %s
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
 
 define i64 @ptrdiff1(ptr %ptr) {
 ; CHECK-LABEL: @ptrdiff1(
-; CHECK:         ret i64 42
+; CHECK-NEXT:    ret i64 42
 ;
   %last = getelementptr inbounds i8, ptr %ptr, i32 42
   %first.int = ptrtoint ptr %ptr to i64
@@ -14,9 +14,24 @@ define i64 @ptrdiff1(ptr %ptr) {
   ret i64 %diff
 }
 
+define i64 @ptrdiff_no_inbounds(ptr %ptr) {
+; CHECK-LABEL: @ptrdiff_no_inbounds(
+; CHECK-NEXT:    [[LAST:%.*]] = getelementptr i8, ptr [[PTR:%.*]], i32 42
+; CHECK-NEXT:    [[FIRST_INT:%.*]] = ptrtoint ptr [[PTR]] to i64
+; CHECK-NEXT:    [[LAST_INT:%.*]] = ptrtoint ptr [[LAST]] to i64
+; CHECK-NEXT:    [[DIFF:%.*]] = sub i64 [[LAST_INT]], [[FIRST_INT]]
+; CHECK-NEXT:    ret i64 [[DIFF]]
+;
+  %last = getelementptr i8, ptr %ptr, i32 42
+  %first.int = ptrtoint ptr %ptr to i64
+  %last.int = ptrtoint ptr %last to i64
+  %diff = sub i64 %last.int, %first.int
+  ret i64 %diff
+}
+
 define i64 @ptrdiff2(ptr %ptr) {
 ; CHECK-LABEL: @ptrdiff2(
-; CHECK:         ret i64 42
+; CHECK-NEXT:    ret i64 42
 ;
   %first2 = getelementptr inbounds i8, ptr %ptr, i32 1
   %first3 = getelementptr inbounds i8, ptr %first2, i32 2
@@ -34,10 +49,10 @@ define i64 @ptrdiff2(ptr %ptr) {
 define i64 @ptrdiff3(ptr %ptr) {
 ; Don't bother with non-inbounds GEPs.
 ; CHECK-LABEL: @ptrdiff3(
-; CHECK:         [[LAST:%.*]] = getelementptr i8, ptr %ptr, i32 42
-; CHECK-NEXT:    [[FIRST_INT:%.*]] = ptrtoint ptr %ptr to i64
+; CHECK-NEXT:    [[LAST1:%.*]] = getelementptr i8, ptr [[LAST:%.*]], i32 42
 ; CHECK-NEXT:    [[LAST_INT:%.*]] = ptrtoint ptr [[LAST]] to i64
-; CHECK-NEXT:    [[DIFF:%.*]] = sub i64 [[LAST_INT]], [[FIRST_INT]]
+; CHECK-NEXT:    [[LAST_INT1:%.*]] = ptrtoint ptr [[LAST1]] to i64
+; CHECK-NEXT:    [[DIFF:%.*]] = sub i64 [[LAST_INT1]], [[LAST_INT]]
 ; CHECK-NEXT:    ret i64 [[DIFF]]
 ;
   %last = getelementptr i8, ptr %ptr, i32 42
@@ -50,7 +65,7 @@ define i64 @ptrdiff3(ptr %ptr) {
 define <4 x i32> @ptrdiff4(<4 x ptr> %arg) nounwind {
 ; Handle simple cases of vectors of pointers.
 ; CHECK-LABEL: @ptrdiff4(
-; CHECK:         ret <4 x i32> zeroinitializer
+; CHECK-NEXT:    ret <4 x i32> zeroinitializer
 ;
   %p1 = ptrtoint <4 x ptr> %arg to <4 x i32>
   %bc = bitcast <4 x ptr> %arg to <4 x ptr>
@@ -65,7 +80,7 @@ define <4 x i32> @ptrdiff4(<4 x ptr> %arg) nounwind {
 
 define i32 @ptrdiff5() nounwind {
 ; CHECK-LABEL: @ptrdiff5(
-; CHECK:       bb:
+; CHECK-NEXT:  bb:
 ; CHECK-NEXT:    ret i32 0
 ;
 bb: