diff options
| author | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-06-08 17:43:09 +0000 |
|---|---|---|
| committer | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-06-08 17:43:09 +0000 |
| commit | 83732bbbae0a6c61592d17081a02be5c07fa66cb (patch) | |
| tree | 11acd2f5c1ac4de504dba7efe3f7804a340a891e | |
| parent | 1a212333916641ea688c1da44645e1e697fbea8b (diff) | |
| download | gcc-83732bbbae0a6c61592d17081a02be5c07fa66cb.tar.gz | |
* jump.c (mark_modified_reg): Allow jump threading if condition
codes are represented by a hard register.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@43030 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/jump.c | 10 |
2 files changed, 13 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f75f9b1521d..2bcea06f39a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2001-06-08 Jakub Jelinek <jakub@redhat.com> + * jump.c (mark_modified_reg): Allow jump threading if condition + codes are represented by a hard register. + +2001-06-08 Jakub Jelinek <jakub@redhat.com> + * config/ia64/ia64.c (ia64_function_arg): Use [SDT]Fmode as gr_mode for complex floats passed to unprototyped functions. diff --git a/gcc/jump.c b/gcc/jump.c index 5d5c6d6e796..feb7b4d8ca3 100644 --- a/gcc/jump.c +++ b/gcc/jump.c @@ -3763,7 +3763,7 @@ static int modified_mem; static void mark_modified_reg (dest, x, data) rtx dest; - rtx x ATTRIBUTE_UNUSED; + rtx x; void *data ATTRIBUTE_UNUSED; { int regno; @@ -3781,7 +3781,13 @@ mark_modified_reg (dest, x, data) regno = REGNO (dest); if (regno >= FIRST_PSEUDO_REGISTER) modified_regs[regno] = 1; - else + /* Don't consider a hard condition code register as modified, + if it is only being set. thread_jumps will check if it is set + to the same value. */ + else if (GET_MODE_CLASS (GET_MODE (dest)) != MODE_CC + || GET_CODE (x) != SET + || ! rtx_equal_p (dest, SET_DEST (x)) + || HARD_REGNO_NREGS (regno, GET_MODE (dest)) != 1) for (i = 0; i < HARD_REGNO_NREGS (regno, GET_MODE (dest)); i++) modified_regs[regno + i] = 1; } |