[PATCH] D80715: [ARM] prologue instructions emitted for naked function with >64 byte argument

[Simon Wallis via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG4dba59689d00: [ARM] prologue instructions emitted for naked function with >64 byte argument (authored by simonwallis2).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80715/new/

https://reviews.llvm.org/D80715

Files:
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/test/CodeGen/ARM/naked-no-prolog.ll


Index: llvm/test/CodeGen/ARM/naked-no-prolog.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/ARM/naked-no-prolog.ll
@@ -0,0 +1,13 @@
+; RUN: llc -mtriple=arm-eabi -mcpu=cortex-a7 -verify-machineinstrs %s -o - | FileCheck %s
+
+%struct.S = type { [65 x i8] }
+
+define void @naked_no_prologue(%struct.S* byval(%struct.S) align 4 %0) naked noinline nounwind optnone {
+; CHECK-NOT: stm
+; CHECK-NOT: str
+
+entry:
+  ret void
+  unreachable
+}
+
Index: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
===================================================================
--- llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -9607,6 +9607,10 @@
   const DataLayout &DL = DAG.getDataLayout();
   SmallVector<ISD::InputArg, 16> Ins;
 
+  // In Naked functions we aren't going to save any registers.
+  if (F.hasFnAttribute(Attribute::Naked))
+    return;
+
   if (!FuncInfo->CanLowerReturn) {
     // Put in an sret pointer parameter before all the other parameters.
     SmallVector<EVT, 1> ValueVTs;


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