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Add implementation for the fcmp instructions. These don't behave -quite- right with respect to quite NaNs, but hopefully we don't need to worry about the distinction.

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--HG--
extra : convert_revision : 67b6583a20530b7a393aa04d0b71031d3c72ecdd
This commit is contained in:
Gabe Black
2007-01-29 22:52:54 -05:00
parent a5cb9b51be
commit 1f7db14dd4
1 changed files with 63 additions and 1 deletions
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64
src/arch/sparc/isa/decoder.isa
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@@ -734,7 +734,69 @@ decode OP default Unknown::unknown()
default: FailUnimpl::fpop1();
}
}
0x35: Trap::fpop2({{fault = new FpDisabled;}});
0x35: decode OPF{
format BasicOperate{
0x51: fcmps({{
uint8_t fcc;
if(isnan(Frs1s) || isnan(Frs2s))
fcc = 3;
else if(Frs1s < Frs2s)
fcc = 1;
else if(Frs1s > Frs2s)
fcc = 2;
else
fcc = 0;
uint8_t firstbit = 10;
if(FCMPCC)
firstbit = FCMPCC * 2 + 30;
Fsr = insertBits(Fsr, firstbit +1, firstbit, fcc);
}});
0x52: fcmpd({{
uint8_t fcc;
if(isnan(Frs1s) || isnan(Frs2s))
fcc = 3;
else if(Frs1s < Frs2s)
fcc = 1;
else if(Frs1s > Frs2s)
fcc = 2;
else
fcc = 0;
uint8_t firstbit = 10;
if(FCMPCC)
firstbit = FCMPCC * 2 + 30;
Fsr = insertBits(Fsr, firstbit +1, firstbit, fcc);
}});
0x53: Trap::fcmpq({{fault = new FpExceptionOther;}});
0x54: fcmpes({{
uint8_t fcc = 0;
if(isnan(Frs1s) || isnan(Frs2s))
fault = new FpExceptionIEEE754;
if(Frs1s < Frs2s)
fcc = 1;
else if(Frs1s > Frs2s)
fcc = 2;
uint8_t firstbit = 10;
if(FCMPCC)
firstbit = FCMPCC * 2 + 30;
Fsr = insertBits(Fsr, firstbit +1, firstbit, fcc);
}});
0x55: fcmped({{
uint8_t fcc = 0;
if(isnan(Frs1s) || isnan(Frs2s))
fault = new FpExceptionIEEE754;
if(Frs1s < Frs2s)
fcc = 1;
else if(Frs1s > Frs2s)
fcc = 2;
uint8_t firstbit = 10;
if(FCMPCC)
firstbit = FCMPCC * 2 + 30;
Fsr = insertBits(Fsr, firstbit +1, firstbit, fcc);
}});
0x56: Trap::fcmpeq({{fault = new FpExceptionOther;}});
default: FailUnimpl::fpop2();
}
}
//This used to be just impdep1, but now it's a whole bunch
//of instructions
0x36: decode OPF{