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authorGabe Black <gblack@eecs.umich.edu>2007-01-30 16:12:38 -0500
committerGabe Black <gblack@eecs.umich.edu>2007-01-30 16:12:38 -0500
commitefb14c585ba1c82c759fccf772368d519d4c02f8 (patch)
treed103157d3c60029e394f16080dcaed4747dad52d
parent0cdcd207ac7e3636ee84b506afc6929417e52202 (diff)
downloadgem5-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
-rw-r--r--src/arch/sparc/isa/base.isa67
-rw-r--r--src/arch/sparc/isa/decoder.isa102
-rw-r--r--src/arch/sparc/isa/formats/branch.isa8
3 files changed, 161 insertions, 16 deletions
diff --git a/src/arch/sparc/isa/base.isa b/src/arch/sparc/isa/base.isa
index 58a17f23e..693cc6876 100644
--- a/src/arch/sparc/isa/base.isa
+++ b/src/arch/sparc/isa/base.isa
@@ -67,6 +67,26 @@ output header {{
OverflowSet=0x7
};
+ enum FpCondTest
+ {
+ FAlways=0x8,
+ FNever=0x0,
+ FUnordered=0x7,
+ FGreater=0x6,
+ FUnorderedOrGreater=0x5,
+ FLess=0x4,
+ FUnorderedOrLess=0x3,
+ FLessOrGreater=0x2,
+ FNotEqual=0x1,
+ FEqual=0x9,
+ FUnorderedOrEqual=0xA,
+ FGreaterOrEqual=0xB,
+ FUnorderedOrGreaterOrEqual=0xC,
+ FLessOrEqual=0xD,
+ FUnorderedOrLessOrEqual=0xE,
+ FOrdered=0xF
+ };
+
extern char * CondTestAbbrev[];
/**
@@ -93,6 +113,8 @@ output header {{
const RegIndex indexArray[], int num) const;
};
+ bool passesFpCondition(uint32_t fcc, uint32_t condition);
+
bool passesCondition(uint32_t codes, uint32_t condition);
inline int64_t sign_ext(uint64_t data, int origWidth)
@@ -367,6 +389,51 @@ output decoder {{
return ss.str();
}
+ bool passesFpCondition(uint32_t fcc, uint32_t condition)
+ {
+ bool u = (fcc == 3);
+ bool g = (fcc == 2);
+ bool l = (fcc == 1);
+ bool e = (fcc == 0);
+ switch(condition)
+ {
+ case FAlways:
+ return 1;
+ case FNever:
+ return 0;
+ case FUnordered:
+ return u;
+ case FGreater:
+ return g;
+ case FUnorderedOrGreater:
+ return u || g;
+ case FLess:
+ return l;
+ case FUnorderedOrLess:
+ return u || l;
+ case FLessOrGreater:
+ return l || g;
+ case FNotEqual:
+ return l || g || u;
+ case FEqual:
+ return e;
+ case FUnorderedOrEqual:
+ return u || e;
+ case FGreaterOrEqual:
+ return g || e;
+ case FUnorderedOrGreaterOrEqual:
+ return u || g || e;
+ case FLessOrEqual:
+ return l || e;
+ case FUnorderedOrLessOrEqual:
+ return u || l || e;
+ case FOrdered:
+ return e || l || g;
+ }
+ panic("Tried testing condition nonexistant "
+ "condition code %d", condition);
+ }
+
bool passesCondition(uint32_t codes, uint32_t condition)
{
CondCodes condCodes;
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:>)
diff --git a/src/arch/sparc/isa/formats/branch.isa b/src/arch/sparc/isa/formats/branch.isa
index 59c6346d6..5cd3ab598 100644
--- a/src/arch/sparc/isa/formats/branch.isa
+++ b/src/arch/sparc/isa/formats/branch.isa
@@ -211,13 +211,13 @@ let {{
{
if(A)
{
- NPC = xc->readNextNPC();
- NNPC = NPC + 4;
+ NNPC = NPC + 8;
+ NPC = NPC + 4;
}
else
{
- NPC = xc->readNextPC();
- NNPC = xc->readNextNPC();
+ NPC = NPC;
+ NNPC = NNPC;
}
}'''
}};