diff options
Diffstat (limited to 'gcc/config/rs6000/rs6000.c')
| -rw-r--r-- | gcc/config/rs6000/rs6000.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 676f9645265..47734a41866 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -10283,13 +10283,14 @@ print_operand (FILE *file, rtx x, int code) 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': @@ -11086,7 +11087,7 @@ rs6000_generate_compare (enum rtx_code code) /* 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) { @@ -11096,8 +11097,8 @@ rs6000_generate_compare (enum rtx_code code) 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) { |
