5fc9449c96
It doesn't matter which value we use for dead args, so let's switch to poison, so we can eventually kill undef. Reviewed By: aeubanks, fhahn Differential Revision: https://reviews.llvm.org/D125983
39 lines
1.3 KiB
LLVM
39 lines
1.3 KiB
LLVM
; RUN: opt < %s -passes=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] poison, i32* byval(i32) %stacked)
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ret i32 %res
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; CHECK: call i32 (i32, i32, ...) @va_func(i32 poison, i32 %in, [6 x i32] poison, i32* byval(i32) %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 poison, i32 %in, [6 x i32] poison, i32* byval(i32) %stacked)
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ret void
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; CHECK: call void (i32, i32, ...) @va_deadret_func(i32 poison, i32 poison, [6 x i32] poison, i32* byval(i32) %stacked)
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}
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