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| author | Gabe Black <gblack@eecs.umich.edu> | 2007-01-30 16:12:38 -0500 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2007-01-30 16:12:38 -0500 |
| commit | efb14c585ba1c82c759fccf772368d519d4c02f8 (patch) | |
| tree | d103157d3c60029e394f16080dcaed4747dad52d /src/arch/sparc/isa/decoder.isa | |
| parent | 0cdcd207ac7e3636ee84b506afc6929417e52202 (diff) | |
| download | gem5-efb14c585ba1c82c759fccf772368d519d4c02f8.tar.xz | |
Implemented fbfss and fbpfcc instructions, and cleaned up branch code a little.
src/arch/sparc/isa/base.isa:
Added passesFpCondition function to help with fbfcc and fbpfcc instructions.
src/arch/sparc/isa/decoder.isa:
Added fbfcc and fbpfcc instructions, and cleaned up branch code slightly.
src/arch/sparc/isa/formats/branch.isa:
Minor cleanup.
--HG--
extra : convert_revision : 6586b46418f1f70bace41407f267fee30c657714
Diffstat (limited to 'src/arch/sparc/isa/decoder.isa')
| -rw-r--r-- | src/arch/sparc/isa/decoder.isa | 102 |
1 files changed, 90 insertions, 12 deletions
diff --git a/src/arch/sparc/isa/decoder.isa b/src/arch/sparc/isa/decoder.isa index 9658578f2..8edb51546 100644 --- a/src/arch/sparc/isa/decoder.isa +++ b/src/arch/sparc/isa/decoder.isa @@ -62,8 +62,8 @@ decode OP default Unknown::unknown() NNPC = NNPC;//Don't do anything }}); 0x1: bpn(19, {{ - NPC = xc->readNextPC() + 4; - NNPC = NPC + 4; + NNPC = NPC + 8; + NPC = NPC + 4; }}, ',a'); } default: decode BPCC @@ -76,15 +76,9 @@ decode OP default Unknown::unknown() }}); 0x2: bpccx(19, {{ if(passesCondition(Ccr<7:4>, COND2)) - { - //warn("Took branch!\n"); NNPC = xc->readPC() + disp; - } else - { - //warn("Didn't take branch!\n"); handle_annul - } }}); } } @@ -109,8 +103,8 @@ decode OP default Unknown::unknown() NNPC = NNPC;//Don't do anything }}); 0x1: bn(22, {{ - NPC = xc->readNextPC() + 4; - NNPC = NPC + 4; + NNPC = NPC + 8; + NPC = NPC + 4; }}, ',a'); } default: bicc(22, {{ @@ -165,8 +159,92 @@ decode OP default Unknown::unknown() } //SETHI (or NOP if rd == 0 and imm == 0) 0x4: SetHi::sethi({{Rd.udw = imm;}}); - 0x5: FailUnimpl::fbpfcc(); - 0x6: FailUnimpl::fbfcc(); + //fbpfcc + 0x5: decode COND2 { + format BranchN { + //Branch Always + 0x8: decode A + { + 0x0: fbpa(22, {{ + NNPC = xc->readPC() + disp; + }}); + 0x1: fbpa(22, {{ + NPC = xc->readPC() + disp; + NNPC = NPC + 4; + }}, ',a'); + } + //Branch Never + 0x0: decode A + { + 0x0: fbpn(22, {{ + NNPC = NNPC;//Don't do anything + }}); + 0x1: fbpn(22, {{ + NNPC = NPC + 8; + NPC = NPC + 4; + }}, ',a'); + } + default: decode BPCC { + 0x0: fbpcc0(22, {{ + if(passesFpCondition(Fsr<11:10>, COND2)) + NNPC = xc->readPC() + disp; + else + handle_annul + }}); + 0x1: fbpcc1(22, {{ + if(passesFpCondition(Fsr<33:32>, COND2)) + NNPC = xc->readPC() + disp; + else + handle_annul + }}); + 0x2: fbpcc2(22, {{ + if(passesFpCondition(Fsr<35:34>, COND2)) + NNPC = xc->readPC() + disp; + else + handle_annul + }}); + 0x3: fbpcc3(22, {{ + if(passesFpCondition(Fsr<37:36>, COND2)) + NNPC = xc->readPC() + disp; + else + handle_annul + }}); + } + } + } + //fbfcc + 0x6: decode COND2 { + format BranchN { + //Branch Always + 0x8: decode A + { + 0x0: fba(22, {{ + NNPC = xc->readPC() + disp; + }}); + 0x1: fba(22, {{ + NPC = xc->readPC() + disp; + NNPC = NPC + 4; + }}, ',a'); + } + //Branch Never + 0x0: decode A + { + 0x0: fbn(22, {{ + NNPC = NNPC;//Don't do anything + }}); + 0x1: fbn(22, {{ + NNPC = NPC + 8; + NPC = NPC + 4; + }}, ',a'); + } + default: fbfcc(22, {{ + if(passesFpCondition(Fsr<11:10>, COND2)) + NNPC = xc->readPC() + disp; + else + handle_annul + }}); + } + } } 0x1: BranchN::call(30, {{ if (Pstate<3:>) |