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| author | Michael Hayes <m.hayes@elec.canterbury.ac.nz> | 1999-02-08 13:50:22 +0000 |
|---|---|---|
| committer | Michael Hayes <m.hayes@gcc.gnu.org> | 1999-02-08 13:50:22 +0000 |
| commit | de67f00e393bc5d623ed70a4ca45d8be271edba1 (patch) | |
| tree | 6d36d7a202963e87558533266f0d313b4c705c75 /gcc | |
| parent | 43790b4468dbf99a5620ce1f5888ca42c2be43a4 (diff) | |
| download | gcc-de67f00e393bc5d623ed70a4ca45d8be271edba1.zip gcc-de67f00e393bc5d623ed70a4ca45d8be271edba1.tar.gz gcc-de67f00e393bc5d623ed70a4ca45d8be271edba1.tar.bz2 | |
c4x.c (c4x_address_cost): Return cost of 1 for REG+REG addressing if strength reduction enabled.
* config/c4x/c4x.c (c4x_address_cost): Return cost of 1 for
REG+REG addressing if strength reduction enabled.
From-SVN: r25086
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/c4x/c4x.c | 8 |
2 files changed, 13 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 196d66e..c81dbb5 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Tue Feb 9 10:46:42 1999 Michael Hayes <m.hayes@elec.canterbury.ac.nz> + + * config/c4x/c4x.c (c4x_address_cost): Return cost of 1 for + REG+REG addressing if strength reduction enabled. + Tue Feb 9 10:10:31 1999 Michael Hayes <m.hayes@elec.canterbury.ac.nz> * config/c4x/t-c4x (LIBGCC2_CFLAGS): Delete. diff --git a/gcc/config/c4x/c4x.c b/gcc/config/c4x/c4x.c index 2e4b941..291c22d 100644 --- a/gcc/config/c4x/c4x.c +++ b/gcc/config/c4x/c4x.c @@ -1508,6 +1508,14 @@ rtx addr; break; case REG: + /* Paradoxically, if we want autoincrement addressing for + complex arithmetic and structure arrays, we must give + REG+REG addressing the same cost as REG addressing to + prevent CSE from avoiding REG+REG addresses. This is + because GIV combination in loop.c is suboptimal and + needs fixing. */ + if (flag_strength_reduce) + return 1; return 2; case CONST_INT: |