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author | Andreas Sandberg <andreas@sandberg.pp.se> | 2013-06-18 16:30:06 +0200 |
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committer | Andreas Sandberg <andreas@sandberg.pp.se> | 2013-06-18 16:30:06 +0200 |
commit | a8e8c4f433fb3cce354950ba72136b84abb78015 (patch) | |
tree | c1b93c2399e0474da011b9aaaa324d4bd14b919e /src/arch/x86/isa/insts/x87/load_constants/load_0_1_or_pi.py | |
parent | c9c02efb99c0a982c116c7d1d8ed9a984c174198 (diff) | |
download | gem5-a8e8c4f433fb3cce354950ba72136b84abb78015.tar.xz |
x86: Fix loading of floating point constants
This changeset actually fixes two issues:
* The lfpimm instruction didn't work correctly when applied to a
floating point constant (it did work for integers containing the
bit string representation of a constant) since it used
reinterpret_cast to convert a double to a uint64_t. This caused a
compilation error, at least, in gcc 4.6.3.
* The instructions loading floating point constants in the x87
processor didn't work correctly since they just stored a truncated
integer instead of a double in the floating point register. This
changeset fixes the old microcode by using lfpimm instruction
instead of the limm instructions.
Diffstat (limited to 'src/arch/x86/isa/insts/x87/load_constants/load_0_1_or_pi.py')
-rw-r--r-- | src/arch/x86/isa/insts/x87/load_constants/load_0_1_or_pi.py | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/arch/x86/isa/insts/x87/load_constants/load_0_1_or_pi.py b/src/arch/x86/isa/insts/x87/load_constants/load_0_1_or_pi.py index cb8947312..9f22af89b 100644 --- a/src/arch/x86/isa/insts/x87/load_constants/load_0_1_or_pi.py +++ b/src/arch/x86/isa/insts/x87/load_constants/load_0_1_or_pi.py @@ -40,17 +40,17 @@ microcode = ''' def macroop FLDZ { - limm ufp1, "double(0)" + lfpimm ufp1, 0.0 movfp st(-1), ufp1, spm=-1 }; def macroop FLD1 { - limm ufp1, "double(1)" + lfpimm ufp1, 1.0 movfp st(-1), ufp1, spm=-1 }; def macroop FLDPI { - limm ufp1, "double(3.14159265359)" + lfpimm ufp1, 3.14159265359 movfp st(-1), ufp1, spm=-1 }; |