Mercurial > hg > CbC > CbC_gcc
diff gcc/testsuite/gcc.dg/strcmpopt_7.c @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/testsuite/gcc.dg/strcmpopt_7.c Thu Feb 13 11:34:05 2020 +0900 @@ -0,0 +1,119 @@ +/* PR tree-optimization/92501 - strncmp with constant unterminated arrays + not folded + { dg-do compile } + { dg-options "-O1 -Wall -fdump-tree-forwprop1" } */ + +/* Unterminated arrays of the size encoded in name. */ +const char a1[] = { '1' }; +const char a12[] = { '1', '2' }; +const char a112[] = { '1', '1', '2' }; +const char a123[] = { '1', '2', '3' }; + +/* Nul-terminated strings of the length encoded in name. */ +const char s[] = ""; +const char s1[] = "1"; +const char s12[] = "12"; +const char s112[] = "112"; +const char s123[] = "123"; + +extern void failure_on_line (int); + +/* Verify that the test in 'if (EQL strncmp (S, T, N))' is folded. */ +#define T(eql, s, t, n) do { \ + if (!(eql __builtin_strncmp (s, t, n))) \ + failure_on_line (__LINE__); \ + } while (0) + + +void test (void) +{ + /* Mixed array and string. */ + T (0 ==, a1, "", 0); + T (0 ==, a1, s, 0); + T (0 !=, a1, "", 1); + T (0 !=, a1, s, 1); + + /* The following two are safe to fold because while strncmp compares + at most N bytes it doesn't compare any bytes past the first nul. */ + T (0 !=, a1, "", 9); + T (0 !=, a1, s, 9); + + T (0 ==, a1, "1", 0); + T (0 ==, a1, s1, 0); + T (0 ==, a1, "1", 1); + T (0 ==, a1, s1, 1); + T (0 ==, a1, "12", 1); + T (0 ==, a1, s12, 1); + + /* As above, the following three are also safe to fold. */ + T (0 !=, a1, s12 + 1, 1); + T (0 !=, a1, s12 + 1, 2); + T (0 !=, a1, s12 + 1, 9); + + T (0 ==, a12, s, 0); + T (0 ==, a12, "", 0); + T (0 ==, a12, s1, 0); + T (0 ==, a12, "1", 0); + T (0 ==, a12, s1, 1); + T (0 ==, a12, "1", 1); + T (0 !=, a12, s1, 2); + T (0 !=, a12, "1", 2); + T (0 ==, a12, s12, 0); + T (0 ==, a12, "12", 0); + T (0 ==, a12, s12, 1); + T (0 ==, a12, "12", 1); + T (0 ==, a12, s12, 2); + T (0 ==, a12, "12", 2); + T (0 ==, a12, s123, 2); + T (0 ==, a12, "123", 2); + + T (0 ==, a12 + 0, s123 + 1, 0); + T (0 !=, a12 + 0, s123 + 1, 1); + T (0 !=, a12 + 0, s123 + 1, 2); + T (0 ==, a12 + 1, s123 + 0, 0); + T (0 !=, a12 + 1, s123 + 0, 1); + T (0 !=, a12 + 1, s123 + 0, 2); + T (0 ==, a12 + 1, s123 + 1, 1); + T (0 !=, a12 + 1, s123 + 2, 1); + T (0 !=, a12 + 1, s123 + 3, 1); + + T (0 ==, a12 + 1, "123" + 1, 1); + T (0 !=, a12 + 1, "123" + 2, 1); + T (0 !=, a12 + 1, "123" + 3, 1); + T (0 !=, a12 + 1, "123" + 3, 9); + + /* Both arguments arrays. */ + T (0 ==, a112 + 0, a1, 1); + T (0 ==, a112 + 1, a1, 1); + T (0 !=, a112 + 2, a1, 1); + + T (0 ==, a1, a112 + 0, 1); + T (0 ==, a1, a112 + 1, 1); + T (0 !=, a1, a112 + 2, 1); + + T (0 ==, a112 + 0, a12, 0); + T (0 ==, a112 + 0, a12, 1); + T (0 !=, a112 + 0, a12, 2); + + T (0 ==, a112 + 1, a12, 2); + T (0 !=, a112 + 1, a12 + 1, 1); + T (0 ==, a112 + 2, a12 + 1, 1); + + /* Mixed array and string. */ + T (0 ==, s112 + 0, a12, 0); + T (0 ==, s112 + 0, a12, 1); + T (0 !=, s112 + 0, a12, 2); + + T (0 ==, s112 + 1, a12, 0); + T (0 ==, s112 + 1, a12, 1); + T (0 ==, s112 + 1, a12, 2); + T (0 !=, s112 + 2, a12, 2); + + T (0 ==, a112 + 0, s1, 1); + T (0 ==, a112 + 1, s1, 1); + T (0 !=, a112 + 2, s1, 1); +} + +/* { dg-final { scan-tree-dump-not "strcmp" "forwprop1" } } + { dg-final { scan-tree-dump-not "strncmp" "forwprop1" } } + { dg-final { scan-tree-dump-not "failure_on_line_" "forwprop1" } } */