scc

Simple C99 Compiler
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commit 8d0d2c097a87b8d96e107bab9b0c9176e75f89ef
parent 78ccf13a90596a1c132707c46679d62e2a18207b
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sat, 21 Mar 2015 03:20:08 -0400

Improve assign() in cc2

Once a value is assigned, left and righ nodes contain the same
content, so both nodes (and the parent) contain a correct value
for the symbol (if any), so any of them can be used instead of
the symbol.

Diffstat:
cc2/cgen.c | 7++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/cc2/cgen.c b/cc2/cgen.c @@ -333,6 +333,7 @@ assign(Node *np) case AUTO: if (rp->op != REG) move(rp, np); + lp->reg = rp->reg; code(LDL, lp, rp); break; case REG: @@ -346,10 +347,10 @@ assign(Node *np) abort(); } - lp->used = 1; np->op = REG; - np->reg = rp->reg; - np->sym = lp->sym; + np->reg = lp->reg; + np->sym = rp->sym = lp->sym; + np->used = rp->used = lp->used = 1; } static void