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| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/combine.c | 2 |
2 files changed, 7 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 966ed62..2e9967c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2000-01-10 Alexandre Oliva <oliva@lsd.ic.unicamp.br> + + * combine.c (expand_field_assignment): Do not discard SUBREGs + while computing nonzero_bits. + 2000-01-09 Nick Clifton <nickc@cygnus.com> * config/arm/arm.c: Fix compile time warnings about signed vs diff --git a/gcc/combine.c b/gcc/combine.c index f8be80c..484d687 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5656,6 +5656,8 @@ expand_field_assignment (x) /* A SUBREG between two modes that occupy the same numbers of words can be done by moving the SUBREG to the source. */ else if (GET_CODE (SET_DEST (x)) == SUBREG + /* We need SUBREGs to compute nonzero_bits properly. */ + && nonzero_sign_valid && (((GET_MODE_SIZE (GET_MODE (SET_DEST (x))) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) == ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (SET_DEST (x)))) |