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authorAli Saidi <Ali.Saidi@ARM.com>2012-09-25 11:49:40 -0500
committerAli Saidi <Ali.Saidi@ARM.com>2012-09-25 11:49:40 -0500
commit04ca96427c1c910f0bddb2403dec9ea517f3869b (patch)
tree9543fed87f3a76b07a7074ab9408a2823f97873c /src
parent17aa2b0f1be705b0f33ff486509b6962cf1a541d (diff)
downloadgem5-04ca96427c1c910f0bddb2403dec9ea517f3869b.tar.xz
ARM: Predict target of more instructions that modify PC.
Diffstat (limited to 'src')
-rw-r--r--src/arch/arm/insts/macromem.cc8
-rw-r--r--src/arch/arm/isa/insts/data.isa15
-rw-r--r--src/arch/arm/isa/templates/mem.isa18
-rw-r--r--src/arch/arm/isa/templates/pred.isa9
4 files changed, 45 insertions, 5 deletions
diff --git a/src/arch/arm/insts/macromem.cc b/src/arch/arm/insts/macromem.cc
index e1b754204..d05ac7728 100644
--- a/src/arch/arm/insts/macromem.cc
+++ b/src/arch/arm/insts/macromem.cc
@@ -113,6 +113,14 @@ MacroMemOp::MacroMemOp(const char *mnem, ExtMachInst machInst,
} else {
*++uop = new MicroLdrUop(machInst, regIdx,
INTREG_UREG0, up, addr);
+ if (reg == INTREG_PC) {
+ (*uop)->setFlag(StaticInst::IsControl);
+ if (!(condCode == COND_AL || condCode == COND_UC))
+ (*uop)->setFlag(StaticInst::IsCondControl);
+ else
+ (*uop)->setFlag(StaticInst::IsUncondControl);
+ (*uop)->setFlag(StaticInst::IsIndirectControl);
+ }
}
}
} else {
diff --git a/src/arch/arm/isa/insts/data.isa b/src/arch/arm/isa/insts/data.isa
index 97ae7d0c0..be56554b0 100644
--- a/src/arch/arm/isa/insts/data.isa
+++ b/src/arch/arm/isa/insts/data.isa
@@ -116,7 +116,8 @@ let {{
regRegOp2 = "shift_rm_rs(Op2, Shift<7:0>, shiftType, 0)"
def buildImmDataInst(mnem, code, flagType = "logic", suffix = "Imm", \
- buildCc = True, buildNonCc = True, instFlags = []):
+ buildCc = True, buildNonCc = True, isBranch = "0", \
+ instFlags = []):
cCode = carryCode[flagType]
vCode = overflowCode[flagType]
negBit = 31
@@ -133,10 +134,12 @@ let {{
immCode = secondOpRe.sub(immOp2, code)
immIop = InstObjParams(mnem, mnem.capitalize() + suffix, "DataImmOp",
{"code" : immCode,
+ "is_branch" : isBranch,
"predicate_test": pickPredicate(immCode)}, instFlags)
immIopCc = InstObjParams(mnem + "s", mnem.capitalize() + suffix + "Cc",
"DataImmOp",
{"code" : immCode + immCcCode,
+ "is_branch" : isBranch,
"predicate_test": pickPredicate(immCode + immCcCode)}, instFlags)
def subst(iop):
@@ -244,7 +247,7 @@ let {{
if regRegAiw:
regRegCode = "AIW" + regRegCode
- buildImmDataInst(mnem, instCode, flagType)
+ buildImmDataInst(mnem, instCode, flagType, isBranch = isBranch)
buildRegDataInst(mnem, instCode, flagType,
isRasPop = isRasPop, isBranch = isBranch)
buildRegRegDataInst(mnem, regRegCode, flagType)
@@ -276,13 +279,15 @@ let {{
buildDataInst("and", "Dest = resTemp = Op1 & secondOp;")
buildDataInst("eor", "Dest = resTemp = Op1 ^ secondOp;")
- buildDataInst("sub", "Dest = resTemp = Op1 - secondOp;", "sub")
+ buildDataInst("sub", "Dest = resTemp = Op1 - secondOp;", "sub",
+ isBranch = "dest == INTREG_PC")
buildDataInst("rsb", "Dest = resTemp = secondOp - Op1;", "rsb")
- buildDataInst("add", "Dest = resTemp = Op1 + secondOp;", "add")
+ buildDataInst("add", "Dest = resTemp = Op1 + secondOp;", "add",
+ isBranch = "dest == INTREG_PC")
buildImmDataInst("adr", '''
Dest = resTemp = (PC & ~0x3) +
(op1 ? secondOp : -secondOp);
- ''')
+ ''', isBranch = "dest == INTREG_PC")
buildDataInst("adc", "Dest = resTemp = Op1 + secondOp + %s;" % oldC, "add")
buildDataInst("sbc", "Dest = resTemp = Op1 - secondOp - !%s;" % oldC, "sub")
buildDataInst("rsc", "Dest = resTemp = secondOp - Op1 - !%s;" % oldC, "rsb")
diff --git a/src/arch/arm/isa/templates/mem.isa b/src/arch/arm/isa/templates/mem.isa
index a4a740f89..2ccda65e1 100644
--- a/src/arch/arm/isa/templates/mem.isa
+++ b/src/arch/arm/isa/templates/mem.isa
@@ -1155,6 +1155,15 @@ def template LoadRegConstructor {{
uops[1]->setLastMicroop();
}
+#else
+ if (_dest == INTREG_PC) {
+ flags[IsControl] = true;
+ flags[IsIndirectControl] = true;
+ if (conditional)
+ flags[IsCondControl] = true;
+ else
+ flags[IsUncondControl] = true;
+ }
#endif
}
}};
@@ -1198,6 +1207,15 @@ def template LoadImmConstructor {{
uops[1] = new %(wb_decl)s;
uops[1]->setLastMicroop();
}
+#else
+ if (_dest == INTREG_PC) {
+ flags[IsControl] = true;
+ flags[IsIndirectControl] = true;
+ if (conditional)
+ flags[IsCondControl] = true;
+ else
+ flags[IsUncondControl] = true;
+ }
#endif
}
}};
diff --git a/src/arch/arm/isa/templates/pred.isa b/src/arch/arm/isa/templates/pred.isa
index 88e8fecd1..918029cc2 100644
--- a/src/arch/arm/isa/templates/pred.isa
+++ b/src/arch/arm/isa/templates/pred.isa
@@ -76,6 +76,15 @@ def template DataImmConstructor {{
_srcRegIdx[_numSrcRegs++] = _destRegIdx[x];
}
}
+
+ if (%(is_branch)s){
+ flags[IsControl] = true;
+ flags[IsIndirectControl] = true;
+ if (condCode == COND_AL || condCode == COND_UC)
+ flags[IsUncondControl] = true;
+ else
+ flags[IsCondControl] = true;
+ }
}
}};