[ARM][LowOverheadLoops] Enable by default

The code is now in a good enough state to pass the bunch of tests that
I have run (after fixing the bugs), so let's enable it by default.

Differential Revision: https://reviews.llvm.org/D65277

llvm-svn: 367297

8 files changed, 22 insertions, 17 deletions

diff --git a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
index 2a8ec734a05..fb5b08df5d3 100644
--- a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -37,7 +37,7 @@ using namespace llvm;
 #define DEBUG_TYPE "armtti"
 
 static cl::opt<bool> DisableLowOverheadLoops(
-  "disable-arm-loloops", cl::Hidden, cl::init(true),
+  "disable-arm-loloops", cl::Hidden, cl::init(false),
   cl::desc("Disable the generation of low-overhead loops"));
 
 bool ARMTTIImpl::areInlineCompatible(const Function *Caller,
diff --git a/llvm/test/Transforms/HardwareLoops/ARM/calls-codegen.ll b/llvm/test/Transforms/HardwareLoops/ARM/calls-codegen.ll
index 85160ced319..2771235d576 100644
--- a/llvm/test/Transforms/HardwareLoops/ARM/calls-codegen.ll
+++ b/llvm/test/Transforms/HardwareLoops/ARM/calls-codegen.ll
@@ -1,4 +1,7 @@
-; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+lob,+mve.fp -disable-arm-loloops=false %s -o - | FileCheck %s
+; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+lob,+mve.fp -disable-arm-loloops=true %s -o - | FileCheck %s --check-prefix=DISABLED
+; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+lob,+mve.fp %s -o - | FileCheck %s
+
+; DISABLED-NOT: dls lr,
 
 ; CHECK-LABEL: test_target_specific:
 ; CHECK:        mov.w lr, #50
diff --git a/llvm/test/Transforms/HardwareLoops/ARM/calls.ll b/llvm/test/Transforms/HardwareLoops/ARM/calls.ll
index d2cce5c3814..43c6d06a108 100644
--- a/llvm/test/Transforms/HardwareLoops/ARM/calls.ll
+++ b/llvm/test/Transforms/HardwareLoops/ARM/calls.ll
@@ -1,8 +1,11 @@
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-MAIN
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+fullfp16 -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FP
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+fp-armv8,+fullfp16 -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FP64
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+mve -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-MVE
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+mve.fp -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-MVEFP
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-MAIN
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+fullfp16 -hardware-loops %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FP
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+fp-armv8,+fullfp16 -hardware-loops %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FP64
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+mve -hardware-loops %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-MVE
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+mve.fp -hardware-loops %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-MVEFP
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops -disable-arm-loloops=true %s -S -o - | FileCheck %s --check-prefix=DISABLED
+
+; DISABLED-NOT: call i32 @llvm.loop.decrement
 
 ; CHECK-LABEL: skip_call
 ; CHECK-NOT: call void @llvm.set.loop.iterations
diff --git a/llvm/test/Transforms/HardwareLoops/ARM/counter.ll b/llvm/test/Transforms/HardwareLoops/ARM/counter.ll
index bdd83d1234b..edb63546428 100644
--- a/llvm/test/Transforms/HardwareLoops/ARM/counter.ll
+++ b/llvm/test/Transforms/HardwareLoops/ARM/counter.ll
@@ -1,4 +1,4 @@
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops -disable-arm-loloops=false %s -o - | FileCheck %s
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops %s -o - | FileCheck %s
 
 @g = common local_unnamed_addr global i32* null, align 4
 
diff --git a/llvm/test/Transforms/HardwareLoops/ARM/do-rem.ll b/llvm/test/Transforms/HardwareLoops/ARM/do-rem.ll
index 144600fe5bf..c3e0d88d8df 100644
--- a/llvm/test/Transforms/HardwareLoops/ARM/do-rem.ll
+++ b/llvm/test/Transforms/HardwareLoops/ARM/do-rem.ll
@@ -1,4 +1,4 @@
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops %s -S -o - | FileCheck %s
 
 @g = common local_unnamed_addr global i32* null, align 4
 
diff --git a/llvm/test/Transforms/HardwareLoops/ARM/fp-emulation.ll b/llvm/test/Transforms/HardwareLoops/ARM/fp-emulation.ll
index ddb4c6a4cea..4bf76b6cdc8 100644
--- a/llvm/test/Transforms/HardwareLoops/ARM/fp-emulation.ll
+++ b/llvm/test/Transforms/HardwareLoops/ARM/fp-emulation.ll
@@ -1,5 +1,5 @@
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+fp-armv8 -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FP
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+soft-float -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SOFT
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+fp-armv8 -hardware-loops %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FP
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+soft-float -hardware-loops %s -S -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SOFT
 
 ; CHECK-LABEL: test_fptosi
 ; CHECK-SOFT-NOT: call void @llvm.set.loop.iterations
diff --git a/llvm/test/Transforms/HardwareLoops/ARM/simple-do.ll b/llvm/test/Transforms/HardwareLoops/ARM/simple-do.ll
index da169eebfd1..8d5cdc1a3fe 100644
--- a/llvm/test/Transforms/HardwareLoops/ARM/simple-do.ll
+++ b/llvm/test/Transforms/HardwareLoops/ARM/simple-do.ll
@@ -1,7 +1,6 @@
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops %s -S -o - | FileCheck %s
 ; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops -disable-arm-loloops=true %s -S -o - | FileCheck %s --check-prefix=DISABLED
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=-lob -hardware-loops %s -S -o - | FileCheck %s --check-prefix=DISABLED
-; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -disable-arm-loloops=false %s -o - | FileCheck %s --check-prefix=CHECK-LLC
+; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi %s -o - | FileCheck %s --check-prefix=CHECK-LLC
 
 ; DISABLED-NOT: llvm.{{.*}}.loop.iterations
 ; DISABLED-NOT: llvm.loop.decrement
diff --git a/llvm/test/Transforms/HardwareLoops/ARM/structure.ll b/llvm/test/Transforms/HardwareLoops/ARM/structure.ll
index 198cbef4681..d413e2b3006 100644
--- a/llvm/test/Transforms/HardwareLoops/ARM/structure.ll
+++ b/llvm/test/Transforms/HardwareLoops/ARM/structure.ll
@@ -1,6 +1,6 @@
-; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops -disable-arm-loloops=false %s -S -o - | FileCheck %s
-; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -disable-arm-loloops=false %s -o - | FileCheck %s --check-prefix=CHECK-LLC
-; RUN: opt -mtriple=thumbv8.1m.main -loop-unroll -unroll-remainder=false -S < %s | llc -mtriple=thumbv8.1m.main -disable-arm-loloops=false | FileCheck %s --check-prefix=CHECK-UNROLL
+; RUN: opt -mtriple=thumbv8.1m.main-arm-none-eabi -hardware-loops %s -S -o - | FileCheck %s
+; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi %s -o - | FileCheck %s --check-prefix=CHECK-LLC
+; RUN: opt -mtriple=thumbv8.1m.main -loop-unroll -unroll-remainder=false -S < %s | llc -mtriple=thumbv8.1m.main | FileCheck %s --check-prefix=CHECK-UNROLL
 
 ; CHECK-LABEL: early_exit
 ; CHECK-NOT: llvm.set.loop.iterations