diff options
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | all.h | 3 | ||||
| -rw-r--r-- | main.c | 1 | ||||
| -rw-r--r-- | simpl.c | 46 |
4 files changed, 51 insertions, 1 deletions
diff --git a/Makefile b/Makefile index fc649f8..4040923 100644 --- a/Makefile +++ b/Makefile @@ -4,7 +4,7 @@ ABI = sysv V = @ OBJDIR = obj -SRC = main.c util.c parse.c cfg.c mem.c ssa.c alias.c load.c copy.c fold.c live.c $(ABI).c isel.c spill.c rega.c emit.c +SRC = main.c util.c parse.c cfg.c mem.c ssa.c alias.c load.c simpl.c copy.c fold.c live.c $(ABI).c isel.c spill.c rega.c emit.c OBJ = $(SRC:%.c=$(OBJDIR)/%.o) CFLAGS += -Wall -Wextra -std=c99 -g -pedantic diff --git a/all.h b/all.h index 128d16c..f518a36 100644 --- a/all.h +++ b/all.h @@ -588,6 +588,9 @@ void fillrpo(Fn *); void ssa(Fn *); void ssacheck(Fn *); +/* simpl.c */ +void simpl(Fn *); + /* copy.c */ void copy(Fn *); diff --git a/main.c b/main.c index fe68ae0..1a8973f 100644 --- a/main.c +++ b/main.c @@ -59,6 +59,7 @@ func(Fn *fn) loadopt(fn); filluse(fn); ssacheck(fn); + simpl(fn); copy(fn); filluse(fn); fold(fn); diff --git a/simpl.c b/simpl.c new file mode 100644 index 0000000..384a8da --- /dev/null +++ b/simpl.c @@ -0,0 +1,46 @@ +#include "all.h" + +static void +elimext(Ins *i, int ext, Fn *fn) +{ + Tmp *t; + Use *u; + + assert(rtype(i->to) == RTmp); + t = &fn->tmp[i->to.val]; + for (u=t->use; u<&t->use[t->nuse]; u++) + if (u->type == UIns + && u->u.ins->op == ext + && (u->u.ins->cls == i->cls || i->cls == Kl)) { + u->u.ins->op = Ocopy; + elimext(u->u.ins, ext, fn); + } +} + +/* requires & preserves uses */ +void +simpl(Fn *fn) +{ + Blk *b; + Ins *i; + int ext; + + for (b=fn->start; b; b=b->link) + for (i=b->ins; i<&b->ins[b->nins]; i++) + switch (i->op) { + case Oloadsb: + case Oloadub: + case Oloadsh: + case Oloaduh: + ext = Oextsb + (i->op - Oloadsb); + goto Elimext; + case Oextsb: + case Oextub: + case Oextsh: + case Oextuh: + ext = i->op; + Elimext: + elimext(i, ext, fn); + break; + } +} |