diff options
Diffstat (limited to 'gcc/regclass.c')
| -rw-r--r-- | gcc/regclass.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/regclass.c b/gcc/regclass.c index a514bd5a4a6..826da242dc1 100644 --- a/gcc/regclass.c +++ b/gcc/regclass.c @@ -2496,6 +2496,24 @@ reg_scan_mark_refs (x, insn, note_flag, min_regno) || GET_CODE (XEXP (note, 0)) == LABEL_REF)))) REG_POINTER (SET_DEST (x)) = 1; + /* If this is setting a register from a register or from a simple + conversion of a register, propagate REG_DECL. */ + if (GET_CODE (dest) == REG) + { + rtx src = SET_SRC (x); + + while (GET_CODE (src) == SIGN_EXTEND + || GET_CODE (src) == ZERO_EXTEND + || GET_CODE (src) == TRUNCATE + || (GET_CODE (src) == SUBREG && subreg_lowpart_p (src))) + src = XEXP (src, 0); + + if (GET_CODE (src) == REG && REGNO_DECL (REGNO (src)) == 0) + REGNO_DECL (REGNO (src)) = REGNO_DECL (REGNO (dest)); + else if (GET_CODE (src) == REG && REGNO_DECL (REGNO (dest)) == 0) + REGNO_DECL (REGNO (dest)) = REGNO_DECL (REGNO (src)); + } + /* ... fall through ... */ default: |