diff options
| author | hpenner <hpenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-03-11 09:17:38 +0000 |
|---|---|---|
| committer | hpenner <hpenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-03-11 09:17:38 +0000 |
| commit | b69139c7db8553e71590350641ddd578cfff98e2 (patch) | |
| tree | 99c6c896b78762f0154b920cb1e21308b46f43d3 /gcc/sched-deps.c | |
| parent | 9f8054625ac4653f4f48efa6a36101d14ae68b4f (diff) | |
| download | gcc-b69139c7db8553e71590350641ddd578cfff98e2.tar.gz | |
* df.c (read_modify_subreg_p): Change from static to global.
* df.h (read_modify_subreg_p): Add prototype.
* sched-deps.c (sched_analyze_1): Generate true dependency for
strict_low_part, certain subregs and zero/sign_extract.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@64164 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/sched-deps.c')
| -rw-r--r-- | gcc/sched-deps.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c index b3c619df51d..874ebc26c7a 100644 --- a/gcc/sched-deps.c +++ b/gcc/sched-deps.c @@ -42,6 +42,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "sched-int.h" #include "params.h" #include "cselib.h" +#include "df.h" extern char *reg_known_equiv_p; extern rtx *reg_known_value; @@ -468,6 +469,19 @@ sched_analyze_1 (deps, x, insn) while (GET_CODE (dest) == STRICT_LOW_PART || GET_CODE (dest) == SUBREG || GET_CODE (dest) == ZERO_EXTRACT || GET_CODE (dest) == SIGN_EXTRACT) { + if (GET_CODE (dest) == STRICT_LOW_PART + || GET_CODE (dest) == ZERO_EXTRACT + || GET_CODE (dest) == SIGN_EXTRACT + || read_modify_subreg_p (dest)) + { + /* These both read and modify the result. We must handle + them as writes to get proper dependencies for following + instructions. We must handle them as reads to get proper + dependencies from this to previous instructions. + Thus we need to call sched_analyze_2. */ + + sched_analyze_2 (deps, XEXP (dest, 0), insn); + } if (GET_CODE (dest) == ZERO_EXTRACT || GET_CODE (dest) == SIGN_EXTRACT) { /* The second and third arguments are values read by this insn. */ |