031d99836d
SPIR-V doesn't support variadic functions, though we make an exception
for `printf`.
If we don't error, we generate invalid SPIR-V because the backend has no
idea how to codegen vararg functions as it is not described in the spec.
We get asm like this:
```
%27 = OpFunction %6 None %7
%28 = OpFunctionParameter %4
; -- End function
```
The above asm is totally invalid, there's no `OpFunctionEnd` and it
causes crashes in downstream tools like `spirv-as` and `spirv-link`.
We already have many `printf` tests locking down that this doesn't break
`printf`, it was already handled elsewhere at the time the error check
runs.
Note the SPIR-V Translator does the same thing, see
[here](https://github.com/KhronosGroup/SPIRV-LLVM-Translator/pull/2703).
---------
Signed-off-by: Nick Sarnie <nick.sarnie@intel.com>
11 lines
373 B
LLVM
11 lines
373 B
LLVM
; RUN: not llc -verify-machineinstrs -O0 -mtriple=spirv64-unknown-unknown --spirv-ext=+SPV_INTEL_function_pointers < %s 2>&1 | FileCheck %s
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define void @bar() {
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entry:
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call spir_func void (i32, ...) @_Z3fooiz(i32 5, i32 3)
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ret void
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}
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; CHECK:error: {{.*}} in function bar void (): SPIR-V does not support variadic functions
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declare spir_func void @_Z3fooiz(i32, ...)
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