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Fix 64 bit shifts in backend. Fix shift by 0.

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Mike Pall 2010-12-06 13:16:35 +01:00
parent 5270586a80
commit a5bdae8f23
1 changed files with 2 additions and 2 deletions
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4
src/lj_asm.c
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@ -2613,9 +2613,9 @@ static void asm_bitshift(ASMState *as, IRIns *ir, x86Shift xs)
if (irref_isk(rref)) { /* Constant shifts. */ if (irref_isk(rref)) { /* Constant shifts. */
int shift; int shift;
dest = ra_dest(as, ir, RSET_GPR); dest = ra_dest(as, ir, RSET_GPR);
shift = irr->i & 31; /* Handle shifts of 0..31 bits. */ shift = irr->i & (irt_is64(ir->t) ? 63 : 31);
switch (shift) { switch (shift) {
case 0: return; case 0: break;
case 1: emit_rr(as, XO_SHIFT1, REX_64IR(ir, xs), dest); break; case 1: emit_rr(as, XO_SHIFT1, REX_64IR(ir, xs), dest); break;
default: emit_shifti(as, REX_64IR(ir, xs), dest, shift); break; default: emit_shifti(as, REX_64IR(ir, xs), dest, shift); break;
} }