diff options
Diffstat (limited to 'gcc/optabs.c')
| -rw-r--r-- | gcc/optabs.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index 87b4f978420..e41747a630f 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -3716,13 +3716,17 @@ can_compare_p (enum rtx_code code, machine_mode mode, } /* This function is called when we are going to emit a compare instruction that - compares the values found in *PX and *PY, using the rtl operator COMPARISON. + compares the values found in X and Y, using the rtl operator COMPARISON. - *PMODE is the mode of the inputs (in case they are const_int). - *PUNSIGNEDP nonzero says that the operands are unsigned; + If they have mode BLKmode, then SIZE specifies the size of both operands. + + UNSIGNEDP nonzero says that the operands are unsigned; this matters if they need to be widened (as given by METHODS). - If they have mode BLKmode, then SIZE specifies the size of both operands. + *PTEST is where the resulting comparison RTX is returned or NULL_RTX + if we failed to produce one. + + *PMODE is the mode of the inputs (in case they are const_int). This function performs all the setup necessary so that the caller only has to emit a single comparison insn. This setup can involve doing a BLKmode |