Francois Pichet
2013-Aug-05 18:09 UTC
[LLVMdev] Promote MVT::f32 load/store to MVT::i32 cause infinite loop in LegalizeDAG?
On my target store/load of f32 or i32 are equivalents. Previously I had duplicate instructions def in .td to map f32 and i32 to the same opcode. I deleted all that and I instead tried a new approach (to simplify things) : setOperationAction(ISD::STORE, MVT::f32, Promote); AddPromotedToType(ISD::STORE, MVT::f32, MVT::i32); setOperationAction(ISD::LOAD, MVT::f32, Promote); AddPromotedToType(ISD::LOAD, MVT::f32, MVT::i32); Now SelectionDAGLegalize::LegalizeDAG() get stuck into an infinite loop. What is going on? I still have the following:(but I think that's fine) addRegisterClass(MVT::f32, &Opus::GR32RegClass); Thanks. (My LLVM is ~3 months old) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130805/90d2ec3b/attachment.html>
Tom Stellard
2013-Aug-05 18:25 UTC
[LLVMdev] Promote MVT::f32 load/store to MVT::i32 cause infinite loop in LegalizeDAG?
On Mon, Aug 05, 2013 at 02:09:58PM -0400, Francois Pichet wrote:> On my target store/load of f32 or i32 are equivalents. > Previously I had duplicate instructions def in .td to map f32 and i32 to > the same opcode. > > I deleted all that and I instead tried a new approach (to simplify things) : > > setOperationAction(ISD::STORE, MVT::f32, Promote); > AddPromotedToType(ISD::STORE, MVT::f32, MVT::i32); > setOperationAction(ISD::LOAD, MVT::f32, Promote); > AddPromotedToType(ISD::LOAD, MVT::f32, MVT::i32); > > Now SelectionDAGLegalize::LegalizeDAG() get stuck into an infinite loop. > What is going on? > > I still have the following:(but I think that's fine) > addRegisterClass(MVT::f32, &Opus::GR32RegClass);Have you specified a register class for MVT::i32? If not, I think that may be your problem. -Tom
Francois Pichet
2013-Aug-05 18:32 UTC
[LLVMdev] Promote MVT::f32 load/store to MVT::i32 cause infinite loop in LegalizeDAG?
On Mon, Aug 5, 2013 at 2:25 PM, Tom Stellard <tom at stellard.net> wrote:> On Mon, Aug 05, 2013 at 02:09:58PM -0400, Francois Pichet wrote: > > On my target store/load of f32 or i32 are equivalents. > > Previously I had duplicate instructions def in .td to map f32 and i32 to > > the same opcode. > > > > I deleted all that and I instead tried a new approach (to simplify > things) : > > > > setOperationAction(ISD::STORE, MVT::f32, Promote); > > AddPromotedToType(ISD::STORE, MVT::f32, MVT::i32); > > setOperationAction(ISD::LOAD, MVT::f32, Promote); > > AddPromotedToType(ISD::LOAD, MVT::f32, MVT::i32); > > > > Now SelectionDAGLegalize::LegalizeDAG() get stuck into an infinite loop. > > What is going on? > > > > I still have the following:(but I think that's fine) > > addRegisterClass(MVT::f32, &Opus::GR32RegClass); > > Have you specified a register class for MVT::i32? If not, I think that > may be your problem. > > -Tom >Yes I have, f32 and i32 map to the same register class: addRegisterClass(MVT::i32, &Opus::GR32RegClass); -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130805/df2cd7eb/attachment.html>
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