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| author | Tristan Gingold | 2015-12-18 17:17:27 +0100 |
|---|---|---|
| committer | Tristan Gingold | 2015-12-18 17:18:13 +0100 |
| commit | fee018a52616f9b257d84df05e565301f28474d3 (patch) | |
| tree | 2797799ffc1cb64714c24ff4e4151b33b937f744 | |
| parent | e8a965f0f42749f7fbcaaee966e24a55fb45d886 (diff) | |
| download | ghdl-fee018a52616f9b257d84df05e565301f28474d3.tar.gz ghdl-fee018a52616f9b257d84df05e565301f28474d3.tar.bz2 ghdl-fee018a52616f9b257d84df05e565301f28474d3.zip | |
ortho-llvm: avoid generation of unreachable code.
| -rw-r--r-- | src/ortho/llvm/ortho_llvm.adb | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/src/ortho/llvm/ortho_llvm.adb b/src/ortho/llvm/ortho_llvm.adb index c0e59bd..f6e3dbe 100644 --- a/src/ortho/llvm/ortho_llvm.adb +++ b/src/ortho/llvm/ortho_llvm.adb @@ -1454,9 +1454,14 @@ package body Ortho_LLVM is Index.LLVM); Tmp : ValueRef; begin - Tmp := BuildGEP (Builder, Arr.LLVM, Idx, Idx'Length, Empty_Cstring); - Tmp := BuildBitCast - (Builder, Tmp, PointerType (Get_LLVM_Type (Res_Type)), Empty_Cstring); + if Unreach then + Tmp := Null_ValueRef; + else + Tmp := BuildGEP (Builder, Arr.LLVM, Idx, Idx'Length, Empty_Cstring); + Tmp := BuildBitCast + (Builder, Tmp, PointerType (Get_LLVM_Type (Res_Type)), + Empty_Cstring); + end if; return O_Lnode'(Direct => False, LLVM => Tmp, Ltype => Res_Type); end New_Slice; @@ -1626,10 +1631,7 @@ package body Ortho_LLVM is function New_Address (Lvalue : O_Lnode; Atype : O_Tnode) return O_Enode is begin - return O_Enode' - (LLVM => BuildBitCast (Builder, Lvalue.LLVM, Get_LLVM_Type (Atype), - Empty_Cstring), - Etype => Atype); + return New_Unchecked_Address (Lvalue, Atype); end New_Address; --------------------------- @@ -1639,11 +1641,15 @@ package body Ortho_LLVM is function New_Unchecked_Address (Lvalue : O_Lnode; Atype : O_Tnode) return O_Enode is + Res : ValueRef; begin - return O_Enode' - (LLVM => BuildBitCast (Builder, Lvalue.LLVM, Get_LLVM_Type (Atype), - Empty_Cstring), - Etype => Atype); + if Unreach then + Res := Null_ValueRef; + else + Res := BuildBitCast (Builder, Lvalue.LLVM, Get_LLVM_Type (Atype), + Empty_Cstring); + end if; + return O_Enode'(LLVM => Res, Etype => Atype); end New_Unchecked_Address; --------------- @@ -1681,6 +1687,12 @@ package body Ortho_LLVM is function New_Obj (Obj : O_Dnode) return O_Lnode is begin + if Unreach then + return O_Lnode'(Direct => False, + LLVM => Null_ValueRef, + Ltype => Obj.Dtype); + end if; + case Obj.Kind is when ON_Const_Decl | ON_Var_Decl |