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propagate IR-level fast-math-flags to DAG nodes (NFC)

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This patch adds the minimum plumbing necessary to use IR-level
fast-math-flags (FMF) in the backend without actually using
them for anything yet. This is a follow-on to:
http://reviews.llvm.org/rL235997

...which split the existing nsw / nuw / exact flags and FMF
into their own struct.

There are 2 structural changes here:

1. The main diff is that we're preparing to extend the optimization
flags to affect more than just binary SDNodes. Eg, IR intrinsics 
( https://llvm.org/bugs/show_bug.cgi?id=21290 ) or non-binop nodes
that don't even exist in IR such as FMA, FNEG, etc.

2. The other change is that we're actually copying the FP fast-math-flags
from the IR instructions to SDNodes. 

Differential Revision: http://reviews.llvm.org/D8900



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel
2015-05-05 21:40:38 +00:00
parent 3b2c61b2e5
commit cc0615ad0a
7 changed files with 109 additions and 99 deletions
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10
include/llvm/CodeGen/SelectionDAG.h
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@@ -655,7 +655,7 @@ public:
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, SDValue N2,
bool nuw = false, bool nsw = false, bool exact = false);
const SDNodeFlags *Flags = nullptr);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, SDValue N2,
SDValue N3);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, SDValue N2,
@@ -978,8 +978,7 @@ public:
/// Get the specified node if it's already available, or else return NULL.
SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs, ArrayRef<SDValue> Ops,
bool nuw = false, bool nsw = false,
bool exact = false);
const SDNodeFlags *Flags = nullptr);
/// Creates a SDDbgValue node.
SDDbgValue *getDbgValue(MDNode *Var, MDNode *Expr, SDNode *N, unsigned R,
@@ -1236,9 +1235,8 @@ private:
void allnodes_clear();
BinarySDNode *GetBinarySDNode(unsigned Opcode, SDLoc DL, SDVTList VTs,
SDValue N1, SDValue N2, bool nuw, bool nsw,
bool exact);
SDNode *GetSDNodeWithFlags(unsigned Opcode, SDLoc DL, SDVTList VTs,
ArrayRef<SDValue> Ops, const SDNodeFlags *Flags);
/// List of non-single value types.
FoldingSet<SDVTListNode> VTListMap;