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Improve handling of inlined strlen on amd64 by using the expensive

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mode for 64 bit add and subtract operations when the bogus literals
flags is set and by adding two new constants to the list of bogus
literals.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4037
This commit is contained in:
Tom Hughes 2005-06-27 08:11:01 +00:00
parent 2bc8de1439
commit e966ae4bc0
1 changed files with 23 additions and 1 deletions
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24
memcheck/mc_translate.c
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@ -1010,6 +1010,14 @@ IRAtom* expensiveAddSub ( MCEnv* mce,
opADD = Iop_Add32;
opSUB = Iop_Sub32;
break;
case Ity_I64:
opAND = Iop_And64;
opOR = Iop_Or64;
opXOR = Iop_Xor64;
opNOT = Iop_Not64;
opADD = Iop_Add64;
opSUB = Iop_Sub64;
break;
default:
VG_(tool_panic)("expensiveAddSub");
}
@ -1678,9 +1686,21 @@ IRAtom* expr2vbits_Binop ( MCEnv* mce,
return mkLeft32(mce, mkUifU32(mce, vatom1,vatom2));
/* could do better: Add64, Sub64 */
case Iop_Mul64:
case Iop_Add64:
if (mce->bogusLiterals)
return expensiveAddSub(mce,True,Ity_I64,
vatom1,vatom2, atom1,atom2);
else
goto cheap_AddSub64;
case Iop_Sub64:
if (mce->bogusLiterals)
return expensiveAddSub(mce,False,Ity_I64,
vatom1,vatom2, atom1,atom2);
else
goto cheap_AddSub64;
cheap_AddSub64:
case Iop_Mul64:
return mkLeft64(mce, mkUifU64(mce, vatom1,vatom2));
case Iop_Mul16:
@ -2464,7 +2484,9 @@ static Bool isBogusAtom ( IRAtom* at )
/* VG_(printf)("%llx\n", n); */
return (/*32*/ n == 0xFEFEFEFFULL
/*32*/ || n == 0x80808080ULL
/*64*/ || n == 0xFFFFFFFFFEFEFEFFULL
/*64*/ || n == 0xFEFEFEFEFEFEFEFFULL
/*64*/ || n == 0x0000000000008080ULL
/*64*/ || n == 0x8080808080808080ULL
/*64*/ || n == 0x0101010101010101ULL
);