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cmd/gc: make qsort comparisons totally ordered

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Otherwise different qsort implementations might result
in different sort orders and therefore different compiled
object files.

Change-Id: Ie783ba55a55af06941307e150b0c406e0a8128b0
Reviewed-on: https://go-review.googlesource.com/4590
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Russ Cox 2015-02-10 22:22:50 -05:00
parent 1250d2e374
commit 90965718a8
2 changed files with 15 additions and 6 deletions
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8
src/cmd/gc/popt.c
View File

@ -532,6 +532,14 @@ startcmp(const void *va, const void *vb)
return -1;
if(a->start > b->start)
return +1;
// Order what's left by id or symbol name,
// just so that sort is forced into a specific ordering,
// so that the result of the sort does not depend on
// the sort implementation.
if(a->def != b->def)
return a->def->id - b->def->id;
if(a->node != b->node)
return strcmp(a->node->sym->name, b->node->sym->name);
return 0;
}

13
src/cmd/gc/reg.c
View File

@ -50,15 +50,16 @@ static int
rcmp(const void *a1, const void *a2)
{
Rgn *p1, *p2;
int c1, c2;
p1 = (Rgn*)a1;
p2 = (Rgn*)a2;
c1 = p2->cost;
c2 = p1->cost;
if(c1 -= c2)
return c1;
return p2->varno - p1->varno;
if(p1->cost != p2->cost)
return p2->cost - p1->cost;
if(p1->varno != p2->varno)
return p2->varno - p1->varno;
if(p1->enter != p2->enter)
return p2->enter->id - p1->enter->id;
return 0;
}
static void