+2006-08-09 Eric Botcazou <ebotcazou@adacore.com>
+
+ * config/rs6000/rs6000.c (print_operand) <D>: Fix comment and adjust.
+ (rs6000_generate_compare): Tweak comments.
+ * config/rs6000/rs6000.md (UNSPEC_MV_CR_GT): Fix comment.
+
2006-08-09 Alexandre Oliva <aoliva@redhat.com>
* var-tracking.c (enum micro_operation_type): Add MO_COPY.
return;
case 'D':
- /* Like 'J' but get to the EQ bit. */
+ /* Like 'J' but get to the GT bit only. */
gcc_assert (GET_CODE (x) == REG);
- /* Bit 1 is EQ bit. */
- i = 4 * (REGNO (x) - CR0_REGNO) + 2;
+ /* Bit 1 is GT bit. */
+ i = 4 * (REGNO (x) - CR0_REGNO) + 1;
- fprintf (file, "%d", i);
+ /* Add one for shift count in rlinm for scc. */
+ fprintf (file, "%d", i + 1);
return;
case 'E':
/* First, the compare. */
compare_result = gen_reg_rtx (comp_mode);
- /* SPE FP compare instructions on the GPRs. Yuck! */
+ /* E500 FP compare instructions on the GPRs. Yuck! */
if ((TARGET_E500 && !TARGET_FPRS && TARGET_HARD_FLOAT)
&& rs6000_compare_fp_p)
{
if (op_mode == VOIDmode)
op_mode = GET_MODE (rs6000_compare_op1);
- /* Note: The E500 comparison instructions set the GT bit (x +
- 1), on success. This explains the mess. */
+ /* The E500 FP compare instructions toggle the GT bit (CR bit 1) only.
+ This explains the following mess. */
switch (code)
{
(UNSPEC_TLSGOTTPREL 28)
(UNSPEC_TLSTLS 29)
(UNSPEC_FIX_TRUNC_TF 30) ; fadd, rounding towards zero
- (UNSPEC_MV_CR_GT 31) ; move_from_CR_eq_bit
+ (UNSPEC_MV_CR_GT 31) ; move_from_CR_gt_bit
(UNSPEC_STFIWX 32)
(UNSPEC_POPCNTB 33)
(UNSPEC_FRES 34)