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151 lines
4.5 KiB
LLVM
151 lines
4.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test that the strncmp library call simplifier works correctly.
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@hello = constant [6 x i8] c"hello\00"
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@hell = constant [5 x i8] c"hell\00"
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@bell = constant [5 x i8] c"bell\00"
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@null = constant [1 x i8] zeroinitializer
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declare i32 @strncmp(i8*, i8*, i32)
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; strncmp("", x, n) -> -*x
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define i32 @test1(i8* %str2) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[STRCMPLOAD:%.*]] = load i8, i8* [[STR2:%.*]], align 1
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; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[STRCMPLOAD]] to i32
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; CHECK-NEXT: [[TMP2:%.*]] = sub nsw i32 0, [[TMP1]]
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; CHECK-NEXT: ret i32 [[TMP2]]
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;
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%str1 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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; strncmp(x, "", n) -> *x
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define i32 @test2(i8* %str1) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[STRCMPLOAD:%.*]] = load i8, i8* [[STR1:%.*]], align 1
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; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[STRCMPLOAD]] to i32
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; CHECK-NEXT: ret i32 [[TMP1]]
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;
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%str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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; strncmp(x, y, n) -> cnst
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define i32 @test3() {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: ret i32 -1
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;
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%str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
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%str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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define i32 @test4() {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: ret i32 1
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;
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%str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
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%str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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define i32 @test5() {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: ret i32 0
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;
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%str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0
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%str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 4)
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ret i32 %temp1
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}
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; strncmp(x,y,1) -> memcmp(x,y,1)
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define i32 @test6(i8* %str1, i8* %str2) {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: [[LHSC:%.*]] = load i8, i8* [[STR1:%.*]], align 1
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; CHECK-NEXT: [[LHSV:%.*]] = zext i8 [[LHSC]] to i32
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; CHECK-NEXT: [[RHSC:%.*]] = load i8, i8* [[STR2:%.*]], align 1
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; CHECK-NEXT: [[RHSV:%.*]] = zext i8 [[RHSC]] to i32
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; CHECK-NEXT: [[CHARDIFF:%.*]] = sub nsw i32 [[LHSV]], [[RHSV]]
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; CHECK-NEXT: ret i32 [[CHARDIFF]]
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;
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 1)
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ret i32 %temp1
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}
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; strncmp(x,y,0) -> 0
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define i32 @test7(i8* %str1, i8* %str2) {
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; CHECK-LABEL: @test7(
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; CHECK-NEXT: ret i32 0
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;
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 0)
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ret i32 %temp1
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}
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; strncmp(x,x,n) -> 0
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define i32 @test8(i8* %str, i32 %n) {
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: ret i32 0
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;
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%temp1 = call i32 @strncmp(i8* %str, i8* %str, i32 %n)
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ret i32 %temp1
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}
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; strncmp(nonnull x, nonnull y, n) -> strncmp(x, y, n)
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define i32 @test9(i8* %str1, i8* %str2, i32 %n) {
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: [[TEMP1:%.*]] = call i32 @strncmp(i8* nonnull [[STR1:%.*]], i8* nonnull [[STR2:%.*]], i32 [[N:%.*]])
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; CHECK-NEXT: ret i32 [[TEMP1]]
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;
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%temp1 = call i32 @strncmp(i8* nonnull %str1, i8* nonnull %str2, i32 %n)
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ret i32 %temp1
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}
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; strncmp(nonnull x, nonnull y, 0) -> 0
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define i32 @test10(i8* %str1, i8* %str2, i32 %n) {
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: ret i32 0
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;
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%temp1 = call i32 @strncmp(i8* nonnull %str1, i8* nonnull %str2, i32 0)
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ret i32 %temp1
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}
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; strncmp(x, y, 5) -> strncmp(nonnull x, nonnull y, 5)
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define i32 @test11(i8* %str1, i8* %str2, i32 %n) {
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; CHECK-LABEL: @test11(
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; CHECK-NEXT: [[TEMP1:%.*]] = call i32 @strncmp(i8* noundef nonnull dereferenceable(1) [[STR1:%.*]], i8* noundef nonnull dereferenceable(1) [[STR2:%.*]], i32 5)
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; CHECK-NEXT: ret i32 [[TEMP1]]
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;
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 5)
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ret i32 %temp1
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}
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define i32 @test12(i8* %str1, i8* %str2, i32 %n) null_pointer_is_valid {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: [[TEMP1:%.*]] = call i32 @strncmp(i8* [[STR1:%.*]], i8* [[STR2:%.*]], i32 [[N:%.*]])
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; CHECK-NEXT: ret i32 [[TEMP1]]
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;
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 %n)
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ret i32 %temp1
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}
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