scc

Simple C99 Compiler
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commit b42ed545c1ed74508795acf70986f2c848defeca
parent 61a52a5ce37ea3f7e1342284d3abc6309df30b1e
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri, 20 Mar 2015 17:29:18 -0400

Rewrite allocreg()

This function is going to be used always to
move some value to it. It is better to include
the movement in the allocreg() function.

Diffstat:
cc2/cgen.c | 22++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/cc2/cgen.c b/cc2/cgen.c @@ -81,16 +81,17 @@ Node regs[] = { } }; -/* TODO: Remove reg8 and reg16 arrays */ +static void moveto(Node *np, uint8_t reg); + static uint8_t -allocreg(uint8_t size) +allocreg(Node *np) { static uint8_t reg8[] = {A, B, C, D, E, H, L, IYL, IY, 0}; static uint8_t reg16[] = {BC, DE, IY, 0}; - Node *np; + Node *r; uint8_t *ary, *bp, c; - switch (size) { + switch (np->type.size) { case 1: ary = reg8; break; @@ -101,23 +102,21 @@ allocreg(uint8_t size) abort(); } for (bp = ary; c = *bp; ++bp) { - np = reguse[c]; + r = reguse[c]; if (np && !np->used) continue; - return c; + moveto(np, c); } /* TODO: What to do here? */ abort(); } -static void moveto(Node *np, uint8_t reg); - static void spill(uint8_t reg) { Node *np, *r; Symbol *sym; - uint8_t p, h, l, new; + uint8_t p, h, l; if ((np = reguse[reg]) == NULL) return; @@ -130,8 +129,7 @@ spill(uint8_t reg) code(LDL, np, r); np->op = sym->kind; } else { - new = allocreg(1); - moveto(np, new); + allocreg(np); } break; default: @@ -247,7 +245,7 @@ move(Node *np, Node *parent) assert(np->type.size == 1); switch (parent->op) { case OASSIG: - moveto(np, allocreg(1)); + allocreg(np); break; case OADD: case OSUB: