diff options
Diffstat (limited to 'test')
-rw-r--r-- | test/Transforms/DeadArgElim/variadic_safety.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/Transforms/DeadArgElim/variadic_safety.ll b/test/Transforms/DeadArgElim/variadic_safety.ll new file mode 100644 index 0000000..15f57bc --- /dev/null +++ b/test/Transforms/DeadArgElim/variadic_safety.ll @@ -0,0 +1,38 @@ +; RUN: opt < %s -deadargelim -S | FileCheck %s + +declare void @llvm.va_start(i8*) + +define internal i32 @va_func(i32 %a, i32 %b, ...) { + %valist = alloca i8 + call void @llvm.va_start(i8* %valist) + + ret i32 %b +} + +; Function derived from AArch64 ABI, where 8 integer arguments go in +; registers but the 9th goes on the stack. We really don't want to put +; just 7 args in registers and then start on the stack since any +; va_arg implementation already present in va_func won't be expecting +; it. +define i32 @call_va(i32 %in) { + %stacked = alloca i32 + store i32 42, i32* %stacked + %res = call i32(i32, i32, ...)* @va_func(i32 %in, i32 %in, [6 x i32] undef, i32* byval %stacked) + ret i32 %res +; CHECK: call i32 (i32, i32, ...)* @va_func(i32 undef, i32 %in, [6 x i32] undef, i32* byval %stacked) +} + +define internal i32 @va_deadret_func(i32 %a, i32 %b, ...) { + %valist = alloca i8 + call void @llvm.va_start(i8* %valist) + + ret i32 %a +} + +define void @call_deadret(i32 %in) { + %stacked = alloca i32 + store i32 42, i32* %stacked + call i32 (i32, i32, ...)* @va_deadret_func(i32 undef, i32 %in, [6 x i32] undef, i32* byval %stacked) + ret void +; CHECK: call void (i32, i32, ...)* @va_deadret_func(i32 undef, i32 undef, [6 x i32] undef, i32* byval %stacked) +} |