diff options
| author | Akira Hatanaka <ahatanak@gmail.com> | 2011-08-12 18:09:59 +0000 |
|---|---|---|
| committer | Akira Hatanaka <ahatanak@gmail.com> | 2011-08-12 18:09:59 +0000 |
| commit | 0285e7d1c14746865a4ef772fec98370a3543a5b (patch) | |
| tree | fdd3e9729483dc818bce9f5d40813c9f6d484bf1 /lib/Target/ARM/Disassembler/ARMDisassembler.cpp | |
| parent | d95f8f6ada29d33686aca700f7f9757113d0acfa (diff) | |
When constant double 0.0 is lowered, make sure 0 is copied directly from an
integer register to a floating point register. It is not valid to interpret
the value of a floating pointer register as part of a double precision
floating point value after a single precision floating point computational
or move instruction stores its result to the register.
- In the test case, the following code is generated before this patch is
applied:
mtc1 $zero, $f2 ; unformatted copy to $f2
mov.s $f0, $f2 ; $f0 is in single format
sdc1 $f12, 0($sp)
mov.s $f1, $f2 ; $f1 is in single format
c.eq.d $f12, $f0 ; $f0 cannot be interpreted as double
- The following code is generated after this patch is applied:
mtc1 $zero, $f0 ; unformatted copy to $f0
mtc1 $zero, $f1 ; unformatted copy to $f1
c.eq.d $f12, $f0 ; $f0 can be interpreted as double
Bhanu Chetlapalli and Chris Dearman at MIPS technologies reported this bug and
provided the test case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137484 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/Disassembler/ARMDisassembler.cpp')
0 files changed, 0 insertions, 0 deletions