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TheRock/compiler/amd-llvm/llvm/test/Transforms/DeadStoreElimination/tail-byval.ll
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

24 lines
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LLVM

; RUN: opt -passes=dse -S < %s | FileCheck %s
; Don't eliminate stores to allocas before tail calls to functions that use
; byval. It's correct to mark calls like these as 'tail'. To implement this tail
; call, the backend should copy the bytes from the alloca into the argument area
; before clearing the stack.
target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i386-unknown-linux-gnu"
declare void @g(ptr byval(i32) %p)
define void @f(ptr byval(i32) %x) {
entry:
%p = alloca i32
%v = load i32, ptr %x
store i32 %v, ptr %p
tail call void @g(ptr byval(i32) %p)
ret void
}
; CHECK-LABEL: define void @f(ptr byval(i32) %x)
; CHECK: store i32 %v, ptr %p
; CHECK: tail call void @g(ptr byval(i32) %p)