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Simplified sraw a little

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git-svn-id: svn://svn.valgrind.org/vex/trunk@995
This commit is contained in:
Cerion Armour-Brown
2005-03-03 02:17:06 +00:00
parent 7d4e96c4bf
commit 4afdddb682
1 changed files with 6 additions and 6 deletions
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12
VEX/priv/guest-ppc32/toIR.c
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@@ -2761,6 +2761,7 @@ static Bool dis_int_shift ( UInt theInstr )
IRTemp sext = newTemp(Ity_I32);
IRTemp Rs = newTemp(Ity_I32);
IRTemp Rs_sh = newTemp(Ity_I32);
IRTemp Rs_msk = newTemp(Ity_I32);
IRTemp Ra = newTemp(Ity_I32);
IRTemp Rb = newTemp(Ity_I32);
IRTemp mask = newTemp(Ity_I32);
@@ -2783,7 +2784,7 @@ static Bool dis_int_shift ( UInt theInstr )
Ra_addr, Rs_addr, Rb_addr);
assign( sh_amt, binop(Iop_And8, mkU8(0x1F),
unop(Iop_32to8, getIReg(Rb_addr))) );
unop(Iop_32to8, mkexpr(Rb))) );
// Rs_shift = Rs >> sh_amt
assign( Rs_sh, binop(Iop_Shr32, mkexpr(Rs), mkexpr(sh_amt)) );
// rb_b5 = Rb[5]
@@ -2799,11 +2800,10 @@ static Bool dis_int_shift ( UInt theInstr )
assign( sext, IRExpr_Mux0X( unop(Iop_32to8, mkexpr(sign)),
mkU32(0),
unop(Iop_Not32, mkexpr(mask)) ));
// Ra = (rb_b5 == 0 ? Rs_sh : 0) | sext
assign( Ra, binop(Iop_Or32, mkexpr(sext),
IRExpr_Mux0X( unop(Iop_32to8, mkexpr(rb_b5)),
mkU32(0), mkexpr(Rs_sh))) );
// Rs_msk = (Rs_sh & mask)
assign( Rs_msk, binop(Iop_And32, mkexpr(Rs_sh), mkexpr(mask)) );
// Ra = Rs_msk | sext
assign( Ra, binop(Iop_Or32, mkexpr(Rs_msk), mkexpr(sext)) );
op = PPC32G_FLAG_OP_SRAW;
do_ca = True;
break;