[clang] [compiler-rt] [Sanitizer] add signed-integer-wrap sanitizer (PR #80089)

[Justin Stitt via cfe-commits]

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@@ -0,0 +1,77 @@
+// Check that -fsanitize=signed-integer-wrap instruments with -fwrapv
+// RUN: %clang_cc1 -fwrapv -triple x86_64-apple-darwin -emit-llvm -o - %s -fsanitize=signed-integer-wrap | FileCheck %s --check-prefix=CHECKSIW
+
+// Check that -fsanitize=signed-integer-overflow doesn't instrument with -fwrapv
+// RUN: %clang_cc1 -fwrapv -triple x86_64-apple-darwin -emit-llvm -o - %s -fsanitize=signed-integer-overflow | FileCheck %s --check-prefix=CHECKSIO
+
+extern volatile int a, b, c;
+
+// CHECKSIW-LABEL: define void @test_add_overflow
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JustinStitt wrote:

I was thinking to be certain that no instrumentation exists we just need to check that no call to the handler exists. The idea being that it's easier to disprove something than to prove it.

https://github.com/llvm/llvm-project/pull/80089