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[AArch64] Disable complex GEP optimization by default.

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Enough concerns were raised that this optimization is pessimising some code patterns.

The obvious fix, to add a Reassociate run afterwards, causes even more pessimisation in some cases due to fewer complex addressing modes being matched. As there isn't a trivial fix for this, backing this out by default until someone gets a chance to fix the addressing mode matcher.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235491 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy 2015-04-22 09:11:38 +00:00
parent e16cac587a
commit 89cc8dd3b8
2 changed files with 4 additions and 4 deletions
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2
lib/Target/AArch64/AArch64TargetMachine.cpp
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@ -85,7 +85,7 @@ EnableA53Fix835769("aarch64-fix-cortex-a53-835769", cl::Hidden,
static cl::opt<bool>
EnableGEPOpt("aarch64-gep-opt", cl::Hidden,
cl::desc("Enable optimizations on complex GEPs"),
cl::init(true));
cl::init(false));
// FIXME: Unify control over GlobalMerge.
static cl::opt<cl::boolOrDefault>

6
test/CodeGen/AArch64/aarch64-gep-opt.ll
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@ -1,6 +1,6 @@
; RUN: llc -O3 -verify-machineinstrs %s -o - | FileCheck %s
; RUN: llc -O3 -print-after=codegenprepare -mcpu=cyclone < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
; RUN: llc -O3 -print-after=codegenprepare -mcpu=cortex-a53 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
; RUN: llc -O3 -aarch64-gep-opt=true -verify-machineinstrs %s -o - | FileCheck %s
; RUN: llc -O3 -aarch64-gep-opt=true -print-after=codegenprepare -mcpu=cyclone < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
; RUN: llc -O3 -aarch64-gep-opt=true -print-after=codegenprepare -mcpu=cortex-a53 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-linux-gnueabi"