diff options
Diffstat (limited to 'gcc/valtrack.c')
| -rw-r--r-- | gcc/valtrack.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/valtrack.c b/gcc/valtrack.c index 87ce3f665b0..997f68b5089 100644 --- a/gcc/valtrack.c +++ b/gcc/valtrack.c @@ -71,7 +71,11 @@ cleanup_auto_inc_dec (rtx src, enum machine_mode mem_mode ATTRIBUTE_UNUSED) /* SCRATCH must be shared because they represent distinct values. */ return x; case CLOBBER: - if (REG_P (XEXP (x, 0)) && REGNO (XEXP (x, 0)) < FIRST_PSEUDO_REGISTER) + /* Share clobbers of hard registers (like cc0), but do not share pseudo reg + clobbers or clobbers of hard registers that originated as pseudos. + This is needed to allow safe register renaming. */ + if (REG_P (XEXP (x, 0)) && REGNO (XEXP (x, 0)) < FIRST_PSEUDO_REGISTER + && ORIGINAL_REGNO (XEXP (x, 0)) == REGNO (XEXP (x, 0))) return x; break; |