[llvm] [clang-tools-extra] [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]

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+// Use of NAN macro will trigger a warning "infinity defined in macro" because
+// on Windows the NAN macro is defined using INFINITY. See below.
+
+// 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
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AaronBallman wrote:

Same thing here as with the other test.

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