[x86] Teach the builtin argument range check to allow invalid ranges in
dead code.
This is important for C++ templates that essentially compute the valid
input in a way that is constant and will cause all the invalid cases to
be dead code that is deleted. Code in the wild actually does this and
GCC also accepts these kinds of patterns so it is important to support
it.
To make this work, we provide a non-error path to diagnose these issues,
and use a default-error warning instead. This keeps the relatively
strict handling but prevents nastiness like SFINAE on these errors. It
also allows us to safely use the system to diagnose this only when it
occurs at runtime (in emitted code).
Entertainingly, this required fixing the syntax in various other ways
for the x86 test because we never bothered to diagnose that the returns
were invalid.
Since debugging these compile failures was super confusing, I've also
improved the diagnostic to actually say what the value was. Most of the
checks I've made ignore this to simplify maintenance, but I've checked
it in a few places to make sure the diagnsotic is working.
Depends on D48462. Without that, we might actually crash some part of
the compiler after bypassing the error here.
Thanks to Richard, Ben Kramer, and especially Craig Topper for all the
help here.
Differential Revision: https://reviews.llvm.org/D48464
llvm-svn: 335309
diff --git a/clang/test/Sema/builtins-x86.cpp b/clang/test/Sema/builtins-x86.cpp
new file mode 100644
index 0000000..d6c03a8
--- /dev/null
+++ b/clang/test/Sema/builtins-x86.cpp
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -triple=x86_64-apple-darwin -fsyntax-only -verify %s
+//
+// Ensure that when we use builtins in C++ code with templates that compute the
+// valid immediate, the dead code with the invalid immediate doesn't error.
+
+typedef short __v8hi __attribute__((__vector_size__(16)));
+
+template <int Imm>
+__v8hi test(__v8hi a) {
+ if (Imm < 4)
+ return __builtin_ia32_pshuflw(a, 0x55 * Imm);
+ else
+ return __builtin_ia32_pshuflw(a, 0x55 * (Imm - 4));
+}
+
+template __v8hi test<0>(__v8hi);
+template __v8hi test<1>(__v8hi);
+template __v8hi test<2>(__v8hi);
+template __v8hi test<3>(__v8hi);
+template __v8hi test<4>(__v8hi);
+template __v8hi test<5>(__v8hi);
+template __v8hi test<6>(__v8hi);
+template __v8hi test<7>(__v8hi);
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