[llvm] eeed154 - [PowerPC] turn off chain commoning by default.

[Chen Zheng via llvm-commits]

Author: Chen Zheng
Date: 2021-11-01T04:11:10Z
New Revision: eeed1545b200374d1e63778f29040c18c5b07f4e

URL: https://github.com/llvm/llvm-project/commit/eeed1545b200374d1e63778f29040c18c5b07f4e
DIFF: https://github.com/llvm/llvm-project/commit/eeed1545b200374d1e63778f29040c18c5b07f4e.diff

LOG: [PowerPC] turn off chain commoning by default.

Added: 
    

Modified: 
    llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
    llvm/test/CodeGen/PowerPC/common-chain-aix32.ll
    llvm/test/CodeGen/PowerPC/common-chain.ll

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp b/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
index 9641a9af5063..b2e0781d81bb 100644
--- a/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
+++ b/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
@@ -125,7 +125,7 @@ static cl::opt<bool> PreferUpdateForm("ppc-formprep-prefer-update",
   cl::desc("prefer update form when ds form is also a update form"));
 
 static cl::opt<bool> EnableChainCommoning(
-    "ppc-formprep-chain-commoning", cl::init(true), cl::Hidden,
+    "ppc-formprep-chain-commoning", cl::init(false), cl::Hidden,
     cl::desc("Enable chain commoning in PPC loop prepare pass."));
 
 // Sum of following 3 per loop thresholds for all loops can not be larger

diff  --git a/llvm/test/CodeGen/PowerPC/common-chain-aix32.ll b/llvm/test/CodeGen/PowerPC/common-chain-aix32.ll
index 906779970904..71061fef3e39 100644
--- a/llvm/test/CodeGen/PowerPC/common-chain-aix32.ll
+++ b/llvm/test/CodeGen/PowerPC/common-chain-aix32.ll
@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -ppc-asm-full-reg-names -verify-machineinstrs \
+; RUN: llc -ppc-asm-full-reg-names -verify-machineinstrs -ppc-formprep-chain-commoning \
 ; RUN:   -mtriple=powerpc-ibm-aix-xcoff -mcpu=pwr9 < %s | FileCheck %s
 
 ; Test that on 32 bit AIX, the chain commoning still works without crash.

diff  --git a/llvm/test/CodeGen/PowerPC/common-chain.ll b/llvm/test/CodeGen/PowerPC/common-chain.ll
index 231ea4306e68..595b4836f436 100644
--- a/llvm/test/CodeGen/PowerPC/common-chain.ll
+++ b/llvm/test/CodeGen/PowerPC/common-chain.ll
@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -ppc-asm-full-reg-names -verify-machineinstrs \
+; RUN: llc -ppc-asm-full-reg-names -verify-machineinstrs -ppc-formprep-chain-commoning \
 ; RUN:   -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr9 < %s | FileCheck %s
 
 ; addresses: