diff --git a/llvm/test/Transforms/AggressiveInstCombine/strcmp.ll b/llvm/test/Transforms/AggressiveInstCombine/strcmp.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/AggressiveInstCombine/strcmp.ll
@@ -0,0 +1,164 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes=aggressive-instcombine -S | FileCheck %s
+
+declare i32 @strcmp(ptr, ptr)
+
+@s0 = constant [1 x i8] c"\00"
+@s1 = constant [2 x i8] c"0\00"
+@s2 = constant [3 x i8] c"01\00"
+@s3 = constant [4 x i8] c"012\00"
+@s4 = constant [5 x i8] c"0123\00"
+
+; Expand strcmp(C, "x").
+
+define i1 @expand_strcmp_s0(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_s0(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s0)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s0)
+  %cmp = icmp eq i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_eq_s1(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_eq_s1(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  %cmp = icmp eq i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_eq_s1_commuted(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_eq_s1_commuted(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr @s1, ptr [[C:%.*]])
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr @s1, ptr %C)
+  %cmp = icmp eq i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_ne_s1(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_ne_s1(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  %cmp = icmp ne i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_sgt_s1(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_sgt_s1(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  %cmp = icmp sgt i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_sge_s1(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_sge_s1(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sge i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  %cmp = icmp sge i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_slt_s1(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_slt_s1(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  %cmp = icmp slt i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_sle_s1(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_sle_s1(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sle i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  %cmp = icmp sle i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_s1_fail_1(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_s1_fail_1(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 1
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  %cmp = icmp eq i32 %call, 1
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_s1_fail_2(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_s1_fail_2(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr @s1, ptr @s1)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr @s1, ptr @s1)
+  %cmp = icmp eq i32 %call, 0
+  ret i1 %cmp
+}
+
+define i32 @expand_strcmp_s1_fail_3(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_s1_fail_3(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s1)
+; CHECK-NEXT:    ret i32 [[CALL]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s1)
+  ret i32 %call
+}
+
+define i1 @expand_strcmp_s2(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_s2(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s2)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s2)
+  %cmp = icmp eq i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_s3(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_s3(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s3)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s3)
+  %cmp = icmp eq i32 %call, 0
+  ret i1 %cmp
+}
+
+define i1 @expand_strcmp_s4(ptr %C) {
+; CHECK-LABEL: @expand_strcmp_s4(
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @strcmp(ptr [[C:%.*]], ptr @s4)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %call = call i32 @strcmp(ptr %C, ptr @s4)
+  %cmp = icmp eq i32 %call, 0
+  ret i1 %cmp
+}