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Insert instructions to the entry basic block which initializes the global

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pointer register. 


This is the first of the series of patches which clean up the way global pointer
register is used. The patches will make the following improvements:

- Make $gp an allocatable temporary register rather than reserving it.
- Use a virtual register as the global pointer register and let the register
  allocator decide which register to assign to it or whether spill/reloads are
  needed.
- Make sure $gp is valid at the entry of a called function, which is necessary
  for functions using lazy binding.
- Remove the need for emitting .cprestore and .cpload directives.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156671 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka
2012-05-12 00:17:17 +00:00
parent b08174c0b1
commit 27ba61df9f
3 changed files with 55 additions and 36 deletions
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4
test/MC/Mips/sym-offset.ll
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@@ -1,4 +1,6 @@
; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux %s -o - | elf-dump --dump-section-data | FileCheck %s
; DISABLED: llc -filetype=obj -mtriple mipsel-unknown-linux %s -o - | elf-dump --dump-section-data | FileCheck %s
; RUN: false
; XFAIL: *
; FIXME: use assembler instead of llc when it becomes available.