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ARM: support PIC on Windows on ARM

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Handle lowering of global addresses for PIC mode compilation on Windows.  Always
use the movw/movt load to load the address as Windows on ARM requires ARMv7+ and
is a pure Thumb environment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208385 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool
2014-05-09 00:58:32 +00:00
parent e584911870
commit 74d614a6fc
3 changed files with 43 additions and 2 deletions
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16
test/CodeGen/ARM/Windows/pic.ll Normal file
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@@ -0,0 +1,16 @@
; RUN: llc -mtriple thumbv7-windows-itanium -relocation-model pic -filetype asm -o - %s \
; RUN: | FileCheck %s
@external = external global i8
define arm_aapcs_vfpcc i8 @return_external() {
entry:
%0 = load i8* @external, align 1
ret i8 %0
}
; CHECK-LABEL: return_external
; CHECK: movw r0, :lower16:external
; CHECK: movt r0, :upper16:external
; CHECK: ldrb r0, [r0]