[PATCH] D156240: [X86] AMD Genoa (znver4) LoopMicroOpBufferSize update

[Ganesh Gopalasubramanian via Phabricator via llvm-commits]

GGanesh updated this revision to Diff 544015.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D156240/new/

https://reviews.llvm.org/D156240

Files:
  llvm/lib/Target/X86/X86ScheduleZnver4.td
  llvm/test/Transforms/LoopUnroll/X86/call-remark.ll


Index: llvm/test/Transforms/LoopUnroll/X86/call-remark.ll
===================================================================
--- llvm/test/Transforms/LoopUnroll/X86/call-remark.ll
+++ llvm/test/Transforms/LoopUnroll/X86/call-remark.ll
@@ -1,5 +1,6 @@
 ; RUN: opt -passes=debugify,loop-unroll -mcpu=znver3 -pass-remarks=loop-unroll -pass-remarks-analysis=loop-unroll < %s -S 2>&1 | FileCheck --check-prefixes=ALL,UNROLL %s
 ; RUN: opt -passes=debugify,loop-unroll -mcpu=znver3 -pass-remarks=TTI -pass-remarks-analysis=TTI  < %s -S 2>&1 | FileCheck --check-prefixes=ALL,TTI %s
+; RUN: opt -passes=debugify,loop-unroll -mcpu=znver4 -pass-remarks=loop-unroll -pass-remarks-analysis=loop-unroll < %s -S 2>&1 | FileCheck --check-prefixes=ALL,UNROLL %s
 
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
Index: llvm/lib/Target/X86/X86ScheduleZnver4.td
===================================================================
--- llvm/lib/Target/X86/X86ScheduleZnver4.td
+++ llvm/lib/Target/X86/X86ScheduleZnver4.td
@@ -37,7 +37,8 @@
   // Ideally for znver4, we should have 6.75K. However we don't add that
   // considerting the impact compile time and prefer using default values 
   // instead.
-  // let LoopMicroOpBufferSize = 6750;
+  // Retaining minimal value to influence unrolling as we did for znver3.
+  let LoopMicroOpBufferSize = 512;
   // AMD SOG 19h, 2.6.2 L1 Data Cache
   // The L1 data cache has a 4- or 5- cycle integer load-to-use latency.
   // AMD SOG 19h, 2.12 L1 Data Cache


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