[InstCombine] Add unsigned variants of gep exact div tests (NFC)

(cherry picked from commit ec2c770)

Author: nikic

llvm/test/Transforms/InstCombine/getelementptr.ll

@@ -116,6 +116,7 @@ define void @test_overaligned_vec(i8 %B) {
 ; CHECK-LABEL: @test_overaligned_vec(
 ; CHECK-NEXT:    store i8 [[B:%.*]], ptr getelementptr inbounds ([10 x i8], ptr @Global, i64 0, i64 2), align 1
 ; CHECK-NEXT:    ret void
+;
   %A = getelementptr <2 x half>, ptr @Global, i64 0, i64 1
   store i8 %B, ptr %A
   ret void
@@ -1473,6 +1474,17 @@ define ptr @gep_sdiv(ptr %p, i64 %off) {
   ret ptr %ptr
 }
 
+define ptr @gep_udiv(ptr %p, i64 %off) {
+; CHECK-LABEL: @gep_udiv(
+; CHECK-NEXT:    [[INDEX:%.*]] = udiv exact i64 [[OFF:%.*]], 7
+; CHECK-NEXT:    [[PTR:%.*]] = getelementptr [[STRUCT_C:%.*]], ptr [[P:%.*]], i64 [[INDEX]]
+; CHECK-NEXT:    ret ptr [[PTR]]
+;
+  %index = udiv exact i64 %off, 7
+  %ptr = getelementptr %struct.C, ptr %p, i64 %index
+  ret ptr %ptr
+}
+
 define <2 x ptr> @gep_sdiv_vec(<2 x ptr> %p, <2 x i64> %off) {
 ; CHECK-LABEL: @gep_sdiv_vec(
 ; CHECK-NEXT:    [[PTR:%.*]] = getelementptr i8, <2 x ptr> [[P:%.*]], <2 x i64> [[OFF:%.*]]
@@ -1503,6 +1515,17 @@ define ptr @gep_ashr(ptr %p, i64 %off) {
   ret ptr %ptr
 }
 
+define ptr @gep_lshr(ptr %p, i64 %off) {
+; CHECK-LABEL: @gep_lshr(
+; CHECK-NEXT:    [[INDEX:%.*]] = lshr exact i64 [[OFF:%.*]], 2
+; CHECK-NEXT:    [[PTR:%.*]] = getelementptr i32, ptr [[P:%.*]], i64 [[INDEX]]
+; CHECK-NEXT:    ret ptr [[PTR]]
+;
+  %index = lshr exact i64 %off, 2
+  %ptr = getelementptr i32, ptr %p, i64 %index
+  ret ptr %ptr
+}
+
 ; Negative tests
 
 define ptr @gep_i8(ptr %p, i64 %off) {
@@ -1525,6 +1548,17 @@ define ptr @gep_sdiv_mismatched_size(ptr %p, i64 %off) {
   ret ptr %ptr
 }
 
+define ptr @gep_udiv_mismatched_size(ptr %p, i64 %off) {
+; CHECK-LABEL: @gep_udiv_mismatched_size(
+; CHECK-NEXT:    [[INDEX:%.*]] = udiv exact i64 [[OFF:%.*]], 20
+; CHECK-NEXT:    [[PTR:%.*]] = getelementptr [[STRUCT_C:%.*]], ptr [[P:%.*]], i64 [[INDEX]]
+; CHECK-NEXT:    ret ptr [[PTR]]
+;
+  %index = udiv exact i64 %off, 20
+  %ptr = getelementptr %struct.C, ptr %p, i64 %index
+  ret ptr %ptr
+}
+
 define ptr @gep_sdiv_without_exact(ptr %p, i64 %off) {
 ; CHECK-LABEL: @gep_sdiv_without_exact(
 ; CHECK-NEXT:    [[INDEX:%.*]] = sdiv i64 [[OFF:%.*]], 7
@@ -1536,6 +1570,17 @@ define ptr @gep_sdiv_without_exact(ptr %p, i64 %off) {
   ret ptr %ptr
 }
 
+define ptr @gep_udiv_without_exact(ptr %p, i64 %off) {
+; CHECK-LABEL: @gep_udiv_without_exact(
+; CHECK-NEXT:    [[INDEX:%.*]] = udiv i64 [[OFF:%.*]], 7
+; CHECK-NEXT:    [[PTR:%.*]] = getelementptr [[STRUCT_C:%.*]], ptr [[P:%.*]], i64 [[INDEX]]
+; CHECK-NEXT:    ret ptr [[PTR]]
+;
+  %index = udiv i64 %off, 7
+  %ptr = getelementptr %struct.C, ptr %p, i64 %index
+  ret ptr %ptr
+}
+
 define ptr @gep_ashr_without_exact(ptr %p, i64 %off) {
 ; CHECK-LABEL: @gep_ashr_without_exact(
 ; CHECK-NEXT:    [[INDEX:%.*]] = ashr i64 [[OFF:%.*]], 2
@@ -1547,6 +1592,17 @@ define ptr @gep_ashr_without_exact(ptr %p, i64 %off) {
   ret ptr %ptr
 }
 
+define ptr @gep_lshr_without_exact(ptr %p, i64 %off) {
+; CHECK-LABEL: @gep_lshr_without_exact(
+; CHECK-NEXT:    [[INDEX:%.*]] = lshr i64 [[OFF:%.*]], 2
+; CHECK-NEXT:    [[PTR:%.*]] = getelementptr i32, ptr [[P:%.*]], i64 [[INDEX]]
+; CHECK-NEXT:    ret ptr [[PTR]]
+;
+  %index = lshr i64 %off, 2
+  %ptr = getelementptr i32, ptr %p, i64 %index
+  ret ptr %ptr
+}
+
 define i1 @test_only_used_by_icmp(ptr %a, ptr %b, ptr %c) {
 ; CHECK-LABEL: @test_only_used_by_icmp(
 ; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr [[B:%.*]], [[C:%.*]]