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Revert part of r142530. The patch potentially hurts performance especially

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on Darwin platforms where -Os means optimize for size without hurting
performance.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143002 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2011-10-26 01:17:44 +00:00
parent a823e3d42c
commit f31151f34e
2 changed files with 3 additions and 4 deletions
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6
lib/Target/ARM/ARMISelLowering.cpp
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@ -2106,8 +2106,9 @@ SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
// If we have T2 ops, we can materialize the address directly via movt/movw
// pair. This is always cheaper in terms of performance, but uses at least 2
// extra bytes.
MachineFunction &MF = DAG.getMachineFunction();
if (Subtarget->useMovt() &&
!DAG.getMachineFunction().getFunction()->hasFnAttr(Attribute::OptimizeForSize)) {
!MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize)) {
++NumMovwMovt;
// FIXME: Once remat is capable of dealing with instructions with register
// operands, expand this into two nodes.
@ -2132,8 +2133,7 @@ SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
// FIXME: Enable this for static codegen when tool issues are fixed.
if (Subtarget->useMovt() && RelocM != Reloc::Static &&
!DAG.getMachineFunction().getFunction()->hasFnAttr(Attribute::OptimizeForSize)) {
if (Subtarget->useMovt() && RelocM != Reloc::Static) {
++NumMovwMovt;
// FIXME: Once remat is capable of dealing with instructions with register
// operands, expand this into two nodes.

1
test/CodeGen/ARM/2011-10-18-DisableMovtSize.ll
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@ -1,4 +1,3 @@
; RUN: llc < %s -mtriple=armv7-apple-darwin | FileCheck %s
; RUN: llc < %s -mtriple=armv7-unknown-linux-eabi | FileCheck %s
; Check that when optimizing for size, a literal pool load is used