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Diffstat (limited to 'test/Transforms/InstCombine/strstr-1.ll')
-rw-r--r-- | test/Transforms/InstCombine/strstr-1.ll | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/strstr-1.ll b/test/Transforms/InstCombine/strstr-1.ll new file mode 100644 index 0000000..81f5271 --- /dev/null +++ b/test/Transforms/InstCombine/strstr-1.ll @@ -0,0 +1,65 @@ +; Test that the strstr library call simplifier works correctly. +; +; RUN: opt < %s -instcombine -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" + +@.str = private constant [1 x i8] zeroinitializer +@.str1 = private constant [2 x i8] c"a\00" +@.str2 = private constant [6 x i8] c"abcde\00" +@.str3 = private constant [4 x i8] c"bcd\00" + +declare i8* @strstr(i8*, i8*) + +; Check strstr(str, "") -> str. + +define i8* @test_simplify1(i8* %str) { +; CHECK: @test_simplify1 + %pat = getelementptr inbounds [1 x i8]* @.str, i32 0, i32 0 + %ret = call i8* @strstr(i8* %str, i8* %pat) + ret i8* %ret +; CHECK-NEXT: ret i8* %str +} + +; Check strstr(str, "a") -> strchr(str, 'a'). + +define i8* @test_simplify2(i8* %str) { +; CHECK: @test_simplify2 + %pat = getelementptr inbounds [2 x i8]* @.str1, i32 0, i32 0 + %ret = call i8* @strstr(i8* %str, i8* %pat) + ret i8* %ret +; CHECK-NEXT: @strchr(i8* %str, i32 97) +} + +; Check strstr("abcde", "bcd") -> "abcde" + 1. + +define i8* @test_simplify3() { +; CHECK: @test_simplify3 + %str = getelementptr inbounds [6 x i8]* @.str2, i32 0, i32 0 + %pat = getelementptr inbounds [4 x i8]* @.str3, i32 0, i32 0 + %ret = call i8* @strstr(i8* %str, i8* %pat) + ret i8* %ret +; CHECK-NEXT: getelementptr inbounds ([6 x i8]* @.str2, i64 0, i64 1) +} + +; Check strstr(str, str) -> str. + +define i8* @test_simplify4(i8* %str) { +; CHECK: @test_simplify4 + %ret = call i8* @strstr(i8* %str, i8* %str) + ret i8* %ret +; CHECK-NEXT: ret i8* %str +} + +; Check strstr(str, pat) == str -> strncmp(str, pat, strlen(str)) == 0. + +define i1 @test_simplify5(i8* %str, i8* %pat) { +; CHECK: @test_simplify5 + %ret = call i8* @strstr(i8* %str, i8* %pat) + %cmp = icmp eq i8* %ret, %str + ret i1 %cmp +; CHECK: [[LEN:%[a-z]+]] = call {{i[0-9]+}} @strlen(i8* %pat) +; CHECK: [[NCMP:%[a-z]+]] = call {{i[0-9]+}} @strncmp(i8* %str, i8* %pat, {{i[0-9]+}} [[LEN]]) +; CHECK: icmp eq {{i[0-9]+}} [[NCMP]], 0 +; CHECK: ret i1 +} |