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author | Akira Hatanaka <ahatanaka@mips.com> | 2013-09-28 00:12:32 +0000 |
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committer | Akira Hatanaka <ahatanaka@mips.com> | 2013-09-28 00:12:32 +0000 |
commit | 6ff59a16a05d43fdda587ce600b5b42a63cf3d33 (patch) | |
tree | 4a9693eab502c4dbff8219cf9e17ea009803e7e6 /test/Bitcode | |
parent | e5f32cf3207da58359a6e3aeeb5b01205645f710 (diff) | |
download | llvm-6ff59a16a05d43fdda587ce600b5b42a63cf3d33.tar.gz llvm-6ff59a16a05d43fdda587ce600b5b42a63cf3d33.tar.bz2 llvm-6ff59a16a05d43fdda587ce600b5b42a63cf3d33.tar.xz |
[mips] Make sure loads from lazy-binding entries do not get CSE'd or hoisted out
of loops.
Previously, two consecutive calls to function "func" would result in the
following sequence of instructions:
1. load $16, %got(func)($gp) // load address of lazy-binding stub.
2. move $25, $16
3. jalr $25 // jump to lazy-binding stub.
4. nop
5. move $25, $16
6. jalr $25 // jump to lazy-binding stub again.
With this patch, the second call directly jumps to func's address, bypassing
the lazy-binding resolution routine:
1. load $25, %got(func)($gp) // load address of lazy-binding stub.
2. jalr $25 // jump to lazy-binding stub.
3. nop
4. load $25, %got(func)($gp) // load resolved address of func.
5. jalr $25 // directly jump to func.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191591 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Bitcode')
0 files changed, 0 insertions, 0 deletions