Add new ISD nodes: ISD::FMINNAN and ISD::FMAXNAN
The intention of these is to be a corollary to ISD::FMINNUM/FMAXNUM,
differing only on how NaNs are treated. FMINNUM returns the non-NaN
input (when given one NaN and one non-NaN), FMINNAN returns the NaN
input instead.
This patch includes support for scalarizing, widening and splitting
vectors, but not expansion or softening. The reason is that these
should never be needed - FMINNAN nodes are only going to be created
in one place (SDAGBuilder::visitSelect) and there we'll check if the
node is legal or custom. I could preemptively add expand and soften
code, but I'm fairly opposed to adding code I can't test. It's bad
enough I can't create tests with this patch, but at least this code
will be exercised by the ARM and AArch64 backends fairly shortly.
llvm-svn: 244581
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
index 0f25a61..8ee98b2 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
@@ -299,6 +299,8 @@
case ISD::FABS:
case ISD::FMINNUM:
case ISD::FMAXNUM:
+ case ISD::FMINNAN:
+ case ISD::FMAXNAN:
case ISD::FCOPYSIGN:
case ISD::FSQRT:
case ISD::FSIN:
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
index e3ae3c2..8551058 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
@@ -108,6 +108,8 @@
case ISD::FMUL:
case ISD::FMINNUM:
case ISD::FMAXNUM:
+ case ISD::FMINNAN:
+ case ISD::FMAXNAN:
case ISD::FPOW:
case ISD::FREM:
@@ -661,6 +663,8 @@
case ISD::FMUL:
case ISD::FMINNUM:
case ISD::FMAXNUM:
+ case ISD::FMINNAN:
+ case ISD::FMAXNAN:
case ISD::SDIV:
case ISD::UDIV:
case ISD::FDIV:
@@ -1960,6 +1964,8 @@
case ISD::XOR:
case ISD::FMINNUM:
case ISD::FMAXNUM:
+ case ISD::FMINNAN:
+ case ISD::FMAXNAN:
Res = WidenVecRes_Binary(N);
break;
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
index 883cc257..cbb0aa1 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
@@ -146,6 +146,8 @@
case ISD::FABS: return "fabs";
case ISD::FMINNUM: return "fminnum";
case ISD::FMAXNUM: return "fmaxnum";
+ case ISD::FMINNAN: return "fminnan";
+ case ISD::FMAXNAN: return "fmaxnan";
case ISD::FNEG: return "fneg";
case ISD::FSQRT: return "fsqrt";
case ISD::FSIN: return "fsin";