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| author | Gabe Black <gblack@eecs.umich.edu> | 2007-01-29 22:52:54 -0500 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2007-01-29 22:52:54 -0500 |
| commit | 1f7db14dd4374d83549db395a6ba477452a25b10 (patch) | |
| tree | 1e7ec9af16b287bbddd241eb046128bc999d5dc7 /src/arch/sparc/isa | |
| parent | a5cb9b51be92aee6d925652b1994233dbc42f05c (diff) | |
| download | gem5-1f7db14dd4374d83549db395a6ba477452a25b10.tar.xz | |
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.
--HG--
extra : convert_revision : 67b6583a20530b7a393aa04d0b71031d3c72ecdd
Diffstat (limited to 'src/arch/sparc/isa')
| -rw-r--r-- | src/arch/sparc/isa/decoder.isa | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/src/arch/sparc/isa/decoder.isa b/src/arch/sparc/isa/decoder.isa index f8f381b65..d9c8286f8 100644 --- a/src/arch/sparc/isa/decoder.isa +++ b/src/arch/sparc/isa/decoder.isa @@ -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{ |