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| author | Tim Northover <Tim.Northover@arm.com> | 2013-05-04 20:14:09 +0000 |
|---|---|---|
| committer | Tim Northover <Tim.Northover@arm.com> | 2013-05-04 20:14:09 +0000 |
| commit | 37cde9755d958f515ea09e4d237a943935128814 (patch) | |
| tree | 491cc70d580b90f459c224c5b5ace699fcdd1db7 /llvm/lib/Bitcode/Reader/BitcodeReader.cpp | |
| parent | 4d01c1e0e62ab0ef31faf61a7597be45ffa5db5c (diff) | |
| download | llvm-37cde9755d958f515ea09e4d237a943935128814.zip llvm-37cde9755d958f515ea09e4d237a943935128814.tar.gz llvm-37cde9755d958f515ea09e4d237a943935128814.tar.bz2 | |
AArch64: add stubs to support long function calls on MCJIT
As with global accesses, external functions could exist anywhere in
memory. Therefore the stub must create a complete 64-bit address. This
patch implements the fragment as (roughly):
movz x16, #:abs_g3:somefunc
movk x16, #:abs_g2_nc:somefunc
movk x16, #:abs_g1_nc:somefunc
movk x16, #:abs_g0_nc:somefunc
br x16
In principle we could save 4 bytes by using a literal-load instead,
but it is unclear that would be more efficient and can only be tested
when real hardware is readily available.
This allows (for example) the MCJIT test 2003-05-07-ArgumentTest to
pass on AArch64.
llvm-svn: 181133
Diffstat (limited to 'llvm/lib/Bitcode/Reader/BitcodeReader.cpp')
0 files changed, 0 insertions, 0 deletions