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another shift bug

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R=r
OCL=19525
CL=19525
This commit is contained in:
Ken Thompson 2008-11-18 17:15:42 -08:00
parent 92a4fe1dd5
commit 93c8d3c41b
1 changed files with 12 additions and 7 deletions
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17
src/cmd/6g/gen.c
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@ -6,7 +6,6 @@
#undef EXTERN
#define EXTERN
#include "gg.h"
//#include "opt.h"
enum
{
@ -93,11 +92,6 @@ if(throwreturn == N) {
gclean();
checklabels();
// if(debug['N']) {
// regopt(ptxt);
// debug['N'] = 0;
// }
if(curfn->type->outtuple != 0) {
gins(ACALL, N, throwreturn);
}
@ -105,6 +99,11 @@ if(throwreturn == N) {
pc->as = ARET; // overwrite AEND
pc->lineno = lineno;
// if(debug['N']) {
// regopt(ptxt);
// debug['N'] = 0;
// }
// fill in argument size
ptxt->to.offset = rnd(curfn->type->argwid, maxround);
@ -1212,6 +1211,12 @@ cgen_shift(int op, Node *nl, Node *nr, Node *res)
if(nr->op == OLITERAL) {
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
if(mpgetfix(nr->val.u.xval) >= nl->type->width*8) {
// large shift gets 2 shifts by width
nodconst(&n3, types[TUINT32], nl->type->width*8-1);
gins(a, &n3, &n1);
gins(a, &n3, &n1);
} else
gins(a, nr, &n1);
gmove(&n1, res);
regfree(&n1);