RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2025-01-06 03:38:34 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

If we have a VLA that has a "use" in a metadata node that's then used

Browse Source 
here but it has no other uses, then we have a problem. E.g.,

  int foo (const int *x) {
    char a[*x];
    return 0;
  }

If we assign 'a' a vreg and fast isel later on has to use the selection
DAG isel, it will want to copy the value to the vreg. However, there are
no uses, which goes counter to what selection DAG isel expects.
<rdar://problem/11134152>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153705 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2012-03-30 00:02:55 +00:00
parent f9e894d21d
commit 84364a4e23
1 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -599,7 +599,18 @@ bool FastISel::SelectCall(const User *I) {
if (!Reg)
Reg = lookUpRegForValue(Address);
if (!Reg && isa<Instruction>(Address) &&
// If we have a VLA that has a "use" in a metadata node that's then used
// here but it has no other uses, then we have a problem. E.g.,
//
// int foo (const int *x) {
// char a[*x];
// return 0;
// }
//
// If we assign 'a' a vreg and fast isel later on has to use the selection
// DAG isel, it will want to copy the value to the vreg. However, there are
// no uses, which goes counter to what selection DAG isel expects.
if (!Reg && !Address->use_empty() && isa<Instruction>(Address) &&
(!isa<AllocaInst>(Address) ||
!FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(Address))))
Reg = FuncInfo.InitializeRegForValue(Address);