Mercurial > hg > CbC > CbC_llvm
diff clang/test/Sema/tautological-unsigned-char-zero-compare.cc @ 221:79ff65ed7e25
LLVM12 Original
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 15 Jun 2021 19:15:29 +0900 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/clang/test/Sema/tautological-unsigned-char-zero-compare.cc Tue Jun 15 19:15:29 2021 +0900 @@ -0,0 +1,39 @@ +// RUN: %clang_cc1 -fsyntax-only \ +// RUN: -fno-signed-char \ +// RUN: -Wtautological-unsigned-zero-compare \ +// RUN: -Wtautological-unsigned-char-zero-compare \ +// RUN: -verify=unsigned %s +// RUN: %clang_cc1 -fsyntax-only \ +// RUN: -Wtautological-unsigned-zero-compare \ +// RUN: -Wtautological-unsigned-char-zero-compare \ +// RUN: -verify=signed %s + +void f(char c, unsigned char uc, signed char cc) { + if (c < 0) + return; + // unsigned-warning@-2 {{comparison of char expression < 0 is always false, since char is interpreted as unsigned}} + if (uc < 0) + return; + // unsigned-warning@-2 {{comparison of unsigned expression < 0 is always false}} + // signed-warning@-3 {{comparison of unsigned expression < 0 is always false}} + if (cc < 0) + return; + // Promoted to integer expressions should not warn. + if (c - 4 < 0) + return; +} + +void ref(char &c, unsigned char &uc, signed char &cc) { + if (c < 0) + return; + // unsigned-warning@-2 {{comparison of char expression < 0 is always false, since char is interpreted as unsigned}} + if (uc < 0) + return; + // unsigned-warning@-2 {{comparison of unsigned expression < 0 is always false}} + // signed-warning@-3 {{comparison of unsigned expression < 0 is always false}} + if (cc < 0) + return; + // Promoted to integer expressions should not warn. + if (c - 4 < 0) + return; +}