diff options
Diffstat (limited to 'gcc/lower-subreg.c')
| -rw-r--r-- | gcc/lower-subreg.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/gcc/lower-subreg.c b/gcc/lower-subreg.c index c8947f9d36a..3ff20eb3de5 100644 --- a/gcc/lower-subreg.c +++ b/gcc/lower-subreg.c @@ -531,6 +531,34 @@ resolve_subreg_use (rtx *px, void *data) return 0; } +/* This is called via for_each_rtx. Look for SUBREGs which can be + decomposed and decomposed REGs that need copying. */ + +static int +adjust_decomposed_uses (rtx *px, void *data ATTRIBUTE_UNUSED) +{ + rtx x = *px; + + if (x == NULL_RTX) + return 0; + + if (resolve_subreg_p (x)) + { + x = simplify_subreg_concatn (GET_MODE (x), SUBREG_REG (x), + SUBREG_BYTE (x)); + + if (x) + *px = x; + else + x = copy_rtx (*px); + } + + if (resolve_reg_p (x)) + *px = copy_rtx (x); + + return 0; +} + /* We are deleting INSN. Move any EH_REGION notes to INSNS. */ static void @@ -886,6 +914,18 @@ resolve_use (rtx pat, rtx insn) return false; } +/* A VAR_LOCATION can be simplified. */ + +static void +resolve_debug (rtx insn) +{ + for_each_rtx (&PATTERN (insn), adjust_decomposed_uses, NULL_RTX); + + df_insn_rescan (insn); + + resolve_reg_notes (insn); +} + /* Checks if INSN is a decomposable multiword-shift or zero-extend and sets the decomposable_context bitmap accordingly. A non-zero value is returned if a decomposable insn has been found. */ @@ -1170,6 +1210,8 @@ decompose_multiword_subregs (void) resolve_clobber (pat, insn); else if (GET_CODE (pat) == USE) resolve_use (pat, insn); + else if (DEBUG_INSN_P (insn)) + resolve_debug (insn); else { rtx set; |