From eb5a560e0026ddaa33b26675d1d70148a3c0ad82 Mon Sep 17 00:00:00 2001
From: Hal Finkel <hfinkel@anl.gov>
Date: Fri, 29 Nov 2013 07:04:59 +0000
Subject: [PATCH] Adjust PPC A2 input operand latencies

On the PPC A2, instructions are only issued after their input operands are
ready. Model this by specifying that input operands are read at dispatch (0
cycles after issue). This changes all input operand latencies from 1 to 0.

Significant test-suite performance changes (these are 99.5% confidence
intervals on 6 runs for both before and after):

speedups:
MultiSource/Benchmarks/sim/sim
	-1.21915% +/- 0.175063%
MultiSource/Benchmarks/TSVC/LinearDependence-flt/LinearDependence-flt
	-1.23946% +/- 1.05133%
SingleSource/Benchmarks/Misc/flops-2
	-1.24237% +/- 0.681362%
MultiSource/Applications/JM/lencod/lencod
	-1.33992% +/- 0.757498%
MultiSource/Benchmarks/TSVC/InductionVariable-flt/InductionVariable-flt
	-1.51802% +/- 1.21468%
MultiSource/Benchmarks/TSVC/GlobalDataFlow-flt/GlobalDataFlow-flt
	-2.18818% +/- 1.28605%
MultiSource/Benchmarks/TSVC/Packing-flt/Packing-flt
	-2.21977% +/- 1.19499%
SingleSource/Benchmarks/BenchmarkGame/spectral-norm
	-2.29822% +/- 0.671871%
MultiSource/Benchmarks/TSVC/Packing-dbl/Packing-dbl
	-2.40975% +/- 0.355931%
SingleSource/Benchmarks/Misc/fp-convert
	-2.41899% +/- 1.04751%
MultiSource/Benchmarks/TSVC/Searching-dbl/Searching-dbl
	-2.50349% +/- 0.126765%
SingleSource/Benchmarks/Misc/flops-3
	-3.00214% +/- 0.700795%
MultiSource/Benchmarks/TSVC/LoopRestructuring-flt/LoopRestructuring-flt
	-3.56995% +/- 3.2929%
MultiSource/Applications/sgefa/sgefa
	-4.24908% +/- 2.00413%
MultiSource/Benchmarks/ASC_Sequoia/IRSmk/IRSmk
	-18.1294% +/- 3.96489%

regressions:
MultiSource/Benchmarks/TSVC/Reductions-dbl/Reductions-dbl
	1.03249% +/- 0.178547%
MultiSource/Applications/hexxagon/hexxagon
	1.16597% +/- 0.285235%
MultiSource/Benchmarks/TSVC/IndirectAddressing-flt/IndirectAddressing-flt
	1.39576% +/- 1.07855%
SingleSource/Benchmarks/Misc-C++/stepanov_v1p2
	1.71539% +/- 0.173182%
MultiSource/Benchmarks/Fhourstones-3.1/fhourstones3.1
	1.90013% +/- 0.866472%
MultiSource/Benchmarks/TSVC/Recurrences-dbl/Recurrences-dbl
	2.39854% +/- 1.05914%
MultiSource/Benchmarks/TSVC/ControlFlow-dbl/ControlFlow-dbl
	2.4402% +/- 0.817904%
MultiSource/Benchmarks/TSVC/LoopRestructuring-dbl/LoopRestructuring-dbl
	5.87997% +/- 3.3172%
MultiSource/Benchmarks/Trimaran/netbench-crc/netbench-crc
	9.02643% +/- 5.79591%
MultiSource/Benchmarks/VersaBench/bmm/bmm
	10.3517% +/- 1.227%

Obviously, there are data points on both sides of this; but I think, overall,
this supports making the change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195951 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCScheduleA2.td | 104 ++++++++++++++--------------
 1 file changed, 52 insertions(+), 52 deletions(-)

diff --git a/lib/Target/PowerPC/PPCScheduleA2.td b/lib/Target/PowerPC/PPCScheduleA2.td
index 509de816aa1..bd95924be8a 100644
--- a/lib/Target/PowerPC/PPCScheduleA2.td
+++ b/lib/Target/PowerPC/PPCScheduleA2.td
@@ -26,117 +26,117 @@ def A2_FU     : FuncUnit; // FI pipeline
 def PPCA2Itineraries : ProcessorItineraries<
   [A2_XU, A2_FU], [], [
   InstrItinData<IIC_IntSimple,   [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [1, 0, 0]>,
   InstrItinData<IIC_IntGeneral,  [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1]>,
+                                 [2, 0, 0]>,
   InstrItinData<IIC_IntCompare,  [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1]>,
+                                 [2, 0, 0]>,
   InstrItinData<IIC_IntDivW,     [InstrStage<1, [A2_XU]>],
-                                 [39, 1, 1]>,
+                                 [39, 0, 0]>,
   InstrItinData<IIC_IntDivD,     [InstrStage<1, [A2_XU]>],
-                                 [71, 1, 1]>,
+                                 [71, 0, 0]>,
   InstrItinData<IIC_IntMulHW,    [InstrStage<1, [A2_XU]>],
-                                 [5, 1, 1]>,
+                                 [5, 0, 0]>,
   InstrItinData<IIC_IntMulHWU,   [InstrStage<1, [A2_XU]>],
-                                 [5, 1, 1]>,
+                                 [5, 0, 0]>,
   InstrItinData<IIC_IntMulLI,    [InstrStage<1, [A2_XU]>],
-                                 [6, 1, 1]>,
+                                 [6, 0, 0]>,
   InstrItinData<IIC_IntRotate,   [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1]>,
+                                 [2, 0, 0]>,
   InstrItinData<IIC_IntRotateD,  [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1]>,
+                                 [2, 0, 0]>,
   InstrItinData<IIC_IntRotateDI, [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1]>,
+                                 [2, 0, 0]>,
   InstrItinData<IIC_IntShift,    [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1]>,
+                                 [2, 0, 0]>,
   InstrItinData<IIC_IntTrapW,    [InstrStage<1, [A2_XU]>],
-                                 [2, 1]>,
+                                 [2, 0]>,
   InstrItinData<IIC_IntTrapD,    [InstrStage<1, [A2_XU]>],
-                                 [2, 1]>,
+                                 [2, 0]>,
   InstrItinData<IIC_BrB,         [InstrStage<1, [A2_XU]>],
-                                 [6, 1, 1]>,
+                                 [6, 0, 0]>,
   InstrItinData<IIC_BrCR,        [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [1, 0, 0]>,
   InstrItinData<IIC_BrMCR,       [InstrStage<1, [A2_XU]>],
-                                 [5, 1, 1]>,
+                                 [5, 0, 0]>,
   InstrItinData<IIC_BrMCRX,      [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [1, 0, 0]>,
   InstrItinData<IIC_LdStDCBA,    [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [1, 0, 0]>,
   InstrItinData<IIC_LdStDCBF,    [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [1, 0, 0]>,
   InstrItinData<IIC_LdStDCBI,    [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [1, 0, 0]>,
   InstrItinData<IIC_LdStLoad,    [InstrStage<1, [A2_XU]>],
-                                 [6, 1, 1]>,
+                                 [6, 0, 0]>,
   InstrItinData<IIC_LdStLoadUpd, [InstrStage<1, [A2_XU]>],
-                                 [6, 8, 1, 1]>,
+                                 [6, 8, 0, 0]>,
   InstrItinData<IIC_LdStLDU,     [InstrStage<1, [A2_XU]>],
-                                 [6, 1, 1]>,
+                                 [6, 0, 0]>,
   InstrItinData<IIC_LdStStore,   [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [0, 0, 0]>,
   InstrItinData<IIC_LdStStoreUpd,[InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1, 1]>,
+                                 [2, 0, 0, 0]>,
   InstrItinData<IIC_LdStICBI,    [InstrStage<1, [A2_XU]>],
-                                 [16, 1, 1]>,
+                                 [16, 0, 0]>,
   InstrItinData<IIC_LdStSTFD,    [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [0, 0, 0]>,
   InstrItinData<IIC_LdStSTFDU,   [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1, 1]>,
+                                 [2, 0, 0, 0]>,
   InstrItinData<IIC_LdStLFD,     [InstrStage<1, [A2_XU]>],
-                                 [7, 1, 1]>,
+                                 [7, 0, 0]>,
   InstrItinData<IIC_LdStLFDU,    [InstrStage<1, [A2_XU]>],
-                                 [7, 9, 1, 1]>,
+                                 [7, 9, 0, 0]>,
   InstrItinData<IIC_LdStLHA,     [InstrStage<1, [A2_XU]>],
-                                 [6, 1, 1]>,
+                                 [6, 0, 0]>,
   InstrItinData<IIC_LdStLHAU,    [InstrStage<1, [A2_XU]>],
-                                 [6, 8, 1, 1]>,
+                                 [6, 8, 0, 0]>,
   InstrItinData<IIC_LdStLWARX,   [InstrStage<1, [A2_XU]>],
-                                 [82, 1, 1]>, // L2 latency
+                                 [82, 0, 0]>, // L2 latency
   InstrItinData<IIC_LdStSTD,     [InstrStage<1, [A2_XU]>],
-                                 [1, 1, 1]>,
+                                 [0, 0, 0]>,
   InstrItinData<IIC_LdStSTDU,    [InstrStage<1, [A2_XU]>],
-                                 [2, 1, 1, 1]>,
+                                 [2, 0, 0, 0]>,
   InstrItinData<IIC_LdStSTDCX,   [InstrStage<1, [A2_XU]>],
-                                 [82, 1, 1]>, // L2 latency
+                                 [82, 0, 0]>, // L2 latency
   InstrItinData<IIC_LdStSTWCX,   [InstrStage<1, [A2_XU]>],
-                                 [82, 1, 1]>, // L2 latency
+                                 [82, 0, 0]>, // L2 latency
   InstrItinData<IIC_LdStSync,    [InstrStage<1, [A2_XU]>],
                                  [6]>,
   InstrItinData<IIC_SprISYNC,    [InstrStage<1, [A2_XU]>],
                                  [16]>,
   InstrItinData<IIC_SprMTMSR,    [InstrStage<1, [A2_XU]>],
-                                 [16, 1]>,
+                                 [16, 0]>,
   InstrItinData<IIC_SprMFCR,     [InstrStage<1, [A2_XU]>],
-                                 [6, 1]>,
+                                 [6, 0]>,
   InstrItinData<IIC_SprMFMSR,    [InstrStage<1, [A2_XU]>],
-                                 [4, 1]>,
+                                 [4, 0]>,
   InstrItinData<IIC_SprMFSPR,    [InstrStage<1, [A2_XU]>],
-                                 [6, 1]>,
+                                 [6, 0]>,
   InstrItinData<IIC_SprMFTB,     [InstrStage<1, [A2_XU]>],
-                                 [4, 1]>,
+                                 [4, 0]>,
   InstrItinData<IIC_SprMTSPR,    [InstrStage<1, [A2_XU]>],
-                                 [6, 1]>,
+                                 [6, 0]>,
   InstrItinData<IIC_SprRFI,      [InstrStage<1, [A2_XU]>],
                                  [16]>,
   InstrItinData<IIC_SprSC,       [InstrStage<1, [A2_XU]>],
                                  [16]>,
   InstrItinData<IIC_FPGeneral,   [InstrStage<1, [A2_FU]>],
-                                 [6, 1, 1]>,
+                                 [6, 0, 0]>,
   InstrItinData<IIC_FPAddSub,    [InstrStage<1, [A2_FU]>],
-                                 [6, 1, 1]>,
+                                 [6, 0, 0]>,
   InstrItinData<IIC_FPCompare,   [InstrStage<1, [A2_FU]>],
-                                 [5, 1, 1]>,
+                                 [5, 0, 0]>,
   InstrItinData<IIC_FPDivD,      [InstrStage<1, [A2_FU]>],
-                                 [72, 1, 1]>,
+                                 [72, 0, 0]>,
   InstrItinData<IIC_FPDivS,      [InstrStage<1, [A2_FU]>],
-                                 [59, 1, 1]>,
+                                 [59, 0, 0]>,
   InstrItinData<IIC_FPSqrt,      [InstrStage<1, [A2_FU]>],
-                                 [69, 1, 1]>,
+                                 [69, 0, 0]>,
   InstrItinData<IIC_FPFused,     [InstrStage<1, [A2_FU]>],
-                                 [6, 1, 1, 1]>,
+                                 [6, 0, 0, 0]>,
   InstrItinData<IIC_FPRes,       [InstrStage<1, [A2_FU]>],
-                                 [6, 1]>
+                                 [6, 0]>
 ]>;
 
 // ===---------------------------------------------------------------------===//
-- 
2.34.1