From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Sat, 16 Mar 2013 00:02:17 +0000 (+0000)
Subject: Define more SchedWrites for annotating X86 instructions.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=e0c489d22b3152cf041255e339d8df45345ca8e4;p=oota-llvm.git

Define more SchedWrites for annotating X86 instructions.

Since almost all X86 instructions can fold loads, use a multiclass to
define register/memory pairs of SchedWrites.

An X86FoldableSchedWrite represents the register version of an
instruction. It holds a reference to the SchedWrite to use when the
instruction folds a load.

This will be used inside multiclasses that define rr and rm instruction
versions together.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177210 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86Schedule.td b/lib/Target/X86/X86Schedule.td
index 5c57520fd0c..da0ca7d28ee 100644
--- a/lib/Target/X86/X86Schedule.td
+++ b/lib/Target/X86/X86Schedule.td
@@ -13,25 +13,71 @@
 
 // Instructions with folded loads need to read the memory operand immediately,
 // but other register operands don't have to be read until the load is ready.
-// These are marked with ReadAfterLd.
+// These operands are marked with ReadAfterLd.
 def ReadAfterLd : SchedRead;
 
 // Instructions with both a load and a store folded are modeled as a folded
 // load + WriteRMW.
 def WriteRMW : SchedWrite;
 
-// Most instructions can fold loads, so every SchedWrite comes in two variants:
-// With and without a folded load.
+// Most instructions can fold loads, so almost every SchedWrite comes in two
+// variants: With and without a folded load.
+// An X86FoldableSchedWrite holds a reference to the corresponding SchedWrite
+// with a folded load.
+class X86FoldableSchedWrite : SchedWrite {
+  // The SchedWrite to use when a load is folded into the instruction.
+  SchedWrite Folded;
+}
 
-// Arithmetic.
-def WriteALU     : SchedWrite; // Simple integer ALU op.
-def WriteALULd   : SchedWrite; // ALU op with folded load.
-def WriteIMul    : SchedWrite; // Integer multiplication.
-def WriteIMulLd  : SchedWrite;
-def WriteIDiv    : SchedWrite; // Integer division.
-def WriteIDivLd  : SchedWrite;
-def WriteLEA     : SchedWrite; // LEA instructions can't fold loads.
+// Multiclass that produces a linked pair of SchedWrites.
+multiclass X86SchedWritePair {
+  // Register-Memory operation.
+  def Ld : SchedWrite;
+  // Register-Register operation.
+  def NAME : X86FoldableSchedWrite {
+    let Folded = !cast<SchedWrite>(NAME#"Ld");
+  }
+}
 
+// Arithmetic.
+defm WriteALU  : X86SchedWritePair; // Simple integer ALU op.
+defm WriteIMul : X86SchedWritePair; // Integer multiplication.
+defm WriteIDiv : X86SchedWritePair; // Integer division.
+def  WriteLEA  : SchedWrite;        // LEA instructions can't fold loads.
+
+// Integer shifts and rotates.
+defm WriteShift : X86SchedWritePair;
+
+// Loads, stores, and moves, not folded with other operations.
+def WriteLoad  : SchedWrite;
+def WriteStore : SchedWrite;
+def WriteMove  : SchedWrite;
+
+// Branches don't produce values, so they have no latency, but they still
+// consume resources. Indirect branches can fold loads.
+defm WriteJump : X86SchedWritePair;
+
+// Floating point. This covers both scalar and vector operations.
+defm WriteFAdd  : X86SchedWritePair; // Floating point add/sub/compare.
+defm WriteFMul  : X86SchedWritePair; // Floating point multiplication.
+defm WriteFDiv  : X86SchedWritePair; // Floating point division.
+defm WriteFSqrt : X86SchedWritePair; // Floating point square root.
+defm WriteFRcp  : X86SchedWritePair; // Floating point reciprocal.
+
+// Vector integer operations.
+defm WriteVecALU   : X86SchedWritePair; // Vector integer ALU op, no logicals.
+defm WriteVecShift : X86SchedWritePair; // Vector integer shifts.
+defm WriteVecIMul  : X86SchedWritePair; // Vector integer multiply.
+
+// Vector bitwise operations.
+// These are often used on both floating point and integer vectors.
+defm WriteVecLogic : X86SchedWritePair; // Vector and/or/xor.
+defm WriteShuffle  : X86SchedWritePair; // Vector shuffles and blends.
+
+// Conversion between integer and float.
+defm WriteCvtF2I : X86SchedWritePair; // Float -> Integer.
+defm WriteCvtI2F : X86SchedWritePair; // Integer -> Float.
+defm WriteCvtF2F : X86SchedWritePair; // Float -> Float size conversion.
 
 //===----------------------------------------------------------------------===//
 // Instruction Itinerary classes used for X86