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[FastISel][ARM] Use MOVT/MOVW if the subtarget requests it. 

This change is also in preparation for a future change to make sure that
the constant materialization uses MOVT/MOVW when available and not a load
from the constant pool.

llvm-svn: 215584
This commit is contained in:
Juergen Ributzka 2014-08-13 21:42:19 +00:00
parent 2cbcf7aad9
commit a5b083853c
2 changed files with 5 additions and 2 deletions
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3
llvm/lib/Target/ARM/ARMFastISel.cpp
View File

@ -546,6 +546,9 @@ unsigned ARMFastISel::ARMMaterializeInt(const Constant *C, MVT VT) {
}
}
if (Subtarget->useMovt(*FuncInfo.MF))
return FastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
// Load from constant pool. For now 32-bit only.
if (VT != MVT::i32)
return false;

4
llvm/test/CodeGen/ARM/fast-isel-mvn.ll
View File

@ -1,5 +1,5 @@
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios | FileCheck %s --check-prefix=ARM
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-linux-gnueabi | FileCheck %s --check-prefix=ARM
; RUN: llc -O0 -verify-machineinstrs -fast-isel-abort -relocation-model=dynamic-no-pic -arm-use-movt=false -mtriple=armv7-apple-ios < %s | FileCheck %s --check-prefix=CHECK --check-prefix=ARM
; RUN: llc -O0 -verify-machineinstrs -fast-isel-abort -relocation-model=dynamic-no-pic -arm-use-movt=false -mtriple=armv7-linux-gnueabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=ARM
; RUN: llc < %s -O0 -verify-machineinstrs -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios | FileCheck %s --check-prefix=THUMB
; rdar://10412592