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author | Tim Northover <tnorthover@apple.com> | 2013-12-08 15:56:50 +0000 |
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committer | Tim Northover <tnorthover@apple.com> | 2013-12-08 15:56:50 +0000 |
commit | 7c4342e90b929a1301261147ea23e60e1ea02f6c (patch) | |
tree | a994d2c0a8ffac6da077f3275ea7c27f20d2054f /lib/Target/Mips/Mips16InstrInfo.cpp | |
parent | d34102e5517685f6974e257aea3c46fb06dca299 (diff) | |
download | llvm-7c4342e90b929a1301261147ea23e60e1ea02f6c.tar.gz llvm-7c4342e90b929a1301261147ea23e60e1ea02f6c.tar.bz2 llvm-7c4342e90b929a1301261147ea23e60e1ea02f6c.tar.xz |
ARM: fix folding of stack-adjustment (yet again).
When trying to eliminate an "sub sp, sp, #N" instruction by folding
it into an existing push/pop using dummy registers, we need to account
for the fact that this might affect precisely how "fp" gets set in the
prologue.
We were attempting this, but assuming that *whenever* we performed a
fold it would make a difference. This is false, for example, in:
push {r4, r7, lr}
add fp, sp, #4
vpush {d8}
sub sp, sp, #8
we can fold the "sub" into the "vpush", forming "vpush {d7, d8}".
However, in that case the "add fp" instruction mustn't change, which
we were getting wrong before.
Should fix PR18160.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196725 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/Mips/Mips16InstrInfo.cpp')
0 files changed, 0 insertions, 0 deletions