+2004-01-26 Michael Hayes <m.hayes@elec.canterbury.ac.nz>
+
+ * config/c4x/c4x.c (legitimize_operands): Truncate invalid shift counts.
+
2004-01-26 Michael Hayes <m.hayes@elec.canterbury.ac.nz>
* config/c4x/c4x.c (c4x_valid_operands): More aggressively reject
/* We can get better code on a C30 if we force constant shift counts
into a register. This way they can get hoisted out of loops,
- tying up a register, but saving an instruction. The downside is
+ tying up a register but saving an instruction. The downside is
that they may get allocated to an address or index register, and
thus we will get a pipeline conflict if there is a nearby
indirect address using an address register.
&& (GET_CODE (operands[2]) != CONST_INT))
operands[2] = gen_rtx_NEG (mode, negate_rtx (mode, operands[2]));
+
+ /* When the shift count is greater than 32 then the result
+ can be implementation dependent. We truncate the result to
+ fit in 5 bits so that we do not emit invalid code when
+ optimising---such as trying to generate lhu2 with 20021124-1.c. */
+ if (((code == ASHIFTRT || code == LSHIFTRT || code == ASHIFT)
+ && (GET_CODE (operands[2]) == CONST_INT))
+ && INTVAL (operands[2]) > (GET_MODE_BITSIZE (mode) - 1))
+ operands[2]
+ = GEN_INT (INTVAL (operands[2]) & (GET_MODE_BITSIZE (mode) - 1));
+
return 1;
}