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// Test that va_end is called when returning from a variadic function.
// Because the IR is kind of ugly, testing at -O0 is very brittle. Instead we
// test that at -O3, LLVM was able to analyse the function correctly and
// optimize-out the va_start and va_end calls and remove the call to
// return_two (Github #1744).
// The optimization (removing back-to-back calls to va_start and va_end) only
// happens from LLVM >= 3.9.
// REQUIRES: atleast_llvm309
// RUN: %ldc %s -c -output-ll -O3 -of=%t.O3.ll \
// RUN: && FileCheck %s --check-prefix OPT3 < %t.O3.ll
module mod;
// OPT3-LABEL: define {{.*}} @{{.*}}void_three_return_paths
void void_three_return_paths(int a, ...)
{
// OPT3: call void @llvm.va_start({{.*}} %[[VA:[0-9]+]])
// OPT3-NOT: return_two
return_two();
if (a > 0)
{
throw new Exception("");
return;
}
// There are two control paths (normal return, exception resume) that
// should call va_end.
// OPT3: call void @llvm.va_end({{.*}} %[[VA]])
// OPT3: call void @llvm.va_end({{.*}} %[[VA]])
}
// OPT3-LABEL: define {{.*}} @{{.*}}return_two
int return_two(...)
{
// OPT3-NOT: va_start
// OPT3-NOT: va_end
// OPT3: ret i32 2
return 2;
}
// Github #1744:
// OPT3-LABEL: define {{.*}} @{{.*}}two_four
int two_four()
{
// OPT3-NOT: return_two
// OPT3: ret i32 8
return return_two() * 4;
}
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