[clang-tools-extra] [llvm] [clang] [CLANG] Add warning when INF or NAN are used in a binary operation or as function argument in fast math mode. (PR #76873)

[Aaron Ballman via cfe-commits]

================
@@ -0,0 +1,178 @@
+// RUN: %clang_cc1 -x c++ -verify=no-inf-no-nan -triple powerpc64le-unknown-unknown %s \
+// RUN: -menable-no-infs -menable-no-nans
+
+// RUN: %clang_cc1 -x c++ -verify -triple powerpc64le-unknown-unknown %s \
+// RUN: -DNOFAST=1
+
+// RUN: %clang_cc1 -x c++ -verify=no-inf -triple powerpc64le-unknown-unknown %s \
+// RUN: -menable-no-infs
+
+// RUN: %clang_cc1 -x c++ -verify=no-nan -triple powerpc64le-unknown-unknown %s \
+// RUN: -menable-no-nans
+
+int isunorderedf (float x, float y);
+#if NOFAST
+// expected-no-diagnostics
+#endif
----------------
AaronBallman wrote:

```suggestion
// RUN: %clang_cc1 -x c++ -verify=no-fast -triple powerpc64le-unknown-unknown %s

// RUN: %clang_cc1 -x c++ -verify=no-inf -triple powerpc64le-unknown-unknown %s \
// RUN: -menable-no-infs

// RUN: %clang_cc1 -x c++ -verify=no-nan -triple powerpc64le-unknown-unknown %s \
// RUN: -menable-no-nans

// no-fast-no-diagnostics

int isunorderedf (float x, float y);
```

https://github.com/llvm/llvm-project/pull/76873