From 5ba62d79923a48c1b1f6a8fc236650f5a8281844 Mon Sep 17 00:00:00 2001 From: lemon Date: Mon, 24 Nov 2025 12:58:46 +0100 Subject: ir: simplify some occurrences of single-argument phis --- ir/builder.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) (limited to 'ir/builder.c') diff --git a/ir/builder.c b/ir/builder.c index c793f80..4b25329 100644 --- a/ir/builder.c +++ b/ir/builder.c @@ -228,19 +228,18 @@ useblk(struct function *fn, struct block *blk) union ref addphi(struct function *fn, enum irclass cls, union ref *r) { - int new; - struct instr ins = { Ophi, cls }; - union ref *refs = NULL; + assert(fn->curblk); + if (fn->curblk->npred == 0) return UNDREF; + if (fn->curblk->npred == 1) /* 1-argument phi is identity */ + return *r; + union ref *refs = NULL; xbgrow(&refs, fn->curblk->npred); memcpy(refs, r, fn->curblk->npred * sizeof *r); vpush(&phitab, refs); - ins.l = mkref(RXXX, phitab.n-1); - - assert(fn->curblk != NULL); /*assert(fn->curblk->ins.n == 0);*/ - new = allocinstr(); - instrtab[new] = ins; + int new = allocinstr(); + instrtab[new] = mkinstr(Ophi, cls, .l.i = phitab.n-1); for (int i = 0; i < fn->curblk->npred; ++i) { adduse(fn->curblk, new, r[i]); } -- cgit v1.2.3