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https://github.com/c64scene-ar/llvm-6502.git
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d84b17e157
Variadic functions are particularly fragile in the face of ABI changes, so this limits how much the pass changes them git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183625 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.2 KiB
LLVM
39 lines
1.2 KiB
LLVM
; RUN: opt < %s -deadargelim -S | FileCheck %s
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declare void @llvm.va_start(i8*)
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define internal i32 @va_func(i32 %a, i32 %b, ...) {
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%valist = alloca i8
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call void @llvm.va_start(i8* %valist)
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ret i32 %b
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}
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; Function derived from AArch64 ABI, where 8 integer arguments go in
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; registers but the 9th goes on the stack. We really don't want to put
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; just 7 args in registers and then start on the stack since any
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; va_arg implementation already present in va_func won't be expecting
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; it.
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define i32 @call_va(i32 %in) {
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%stacked = alloca i32
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store i32 42, i32* %stacked
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%res = call i32(i32, i32, ...)* @va_func(i32 %in, i32 %in, [6 x i32] undef, i32* byval %stacked)
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ret i32 %res
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; CHECK: call i32 (i32, i32, ...)* @va_func(i32 undef, i32 %in, [6 x i32] undef, i32* byval %stacked)
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}
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define internal i32 @va_deadret_func(i32 %a, i32 %b, ...) {
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%valist = alloca i8
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call void @llvm.va_start(i8* %valist)
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ret i32 %a
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}
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define void @call_deadret(i32 %in) {
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%stacked = alloca i32
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store i32 42, i32* %stacked
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call i32 (i32, i32, ...)* @va_deadret_func(i32 undef, i32 %in, [6 x i32] undef, i32* byval %stacked)
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ret void
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; CHECK: call void (i32, i32, ...)* @va_deadret_func(i32 undef, i32 undef, [6 x i32] undef, i32* byval %stacked)
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}
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