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cmd/6g: fix crash in cgen_bmul.

Browse Source 
Used to print:
../test/torture.go:116: internal compiler error: bad width: 0463 (../test/torture.go:116) MOVB    ,BX (0, 8)

R=nigeltao, rsc
CC=golang-dev
https://golang.org/cl/6736068
This commit is contained in:
Rémy Oudompheng 2012-10-26 00:29:44 +02:00
parent b575e3ca99
commit 335eef85c3
2 changed files with 75 additions and 12 deletions
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29
src/cmd/6g/ggen.c
View File

@ -984,15 +984,10 @@ ret:
void
cgen_bmul(int op, Node *nl, Node *nr, Node *res)
{
Node n1, n2, *tmp;
Node n1, n2, n1b, n2b, *tmp;
Type *t;
int a;
// copy from byte to full registers
t = types[TUINT64];
if(issigned[nl->type->etype])
t = types[TINT64];
// largest ullman on left.
if(nl->ullman < nr->ullman) {
tmp = nl;
@ -1000,15 +995,25 @@ cgen_bmul(int op, Node *nl, Node *nr, Node *res)
nr = tmp;
}
regalloc(&n1, t, res);
cgen(nl, &n1);
regalloc(&n2, t, N);
cgen(nr, &n2);
// generate operands in "8-bit" registers.
regalloc(&n1b, nl->type, res);
cgen(nl, &n1b);
regalloc(&n2b, nr->type, N);
cgen(nr, &n2b);
// perform full-width multiplication.
t = types[TUINT64];
if(issigned[nl->type->etype])
t = types[TINT64];
nodreg(&n1, t, n1b.val.u.reg);
nodreg(&n2, t, n2b.val.u.reg);
a = optoas(op, t);
gins(a, &n2, &n1);
regfree(&n2);
// truncate.
gmove(&n1, res);
regfree(&n1);
regfree(&n1b);
regfree(&n2b);
}
void

58
test/torture.go
View File

@ -58,6 +58,64 @@ func determinant(m [4][4]float64) float64 {
m[0][3]*m[1][2]*m[2][1]*m[3][0]
}
// Compute the determinant of a 4x4-matrix by the sum
// over all index permutations.
func determinantInt(m [4][4]int) int {
return m[0][0]*m[1][1]*m[2][2]*m[3][3] -
m[0][0]*m[1][1]*m[2][3]*m[3][2] -
m[0][0]*m[1][2]*m[2][1]*m[3][3] +
m[0][0]*m[1][2]*m[2][3]*m[3][1] +
m[0][0]*m[1][3]*m[2][1]*m[3][2] -
m[0][0]*m[1][3]*m[2][2]*m[3][1] -
m[0][1]*m[1][0]*m[2][2]*m[3][3] +
m[0][1]*m[1][0]*m[2][3]*m[3][2] +
m[0][1]*m[1][2]*m[2][0]*m[3][3] -
m[0][1]*m[1][2]*m[2][3]*m[3][0] -
m[0][1]*m[1][3]*m[2][0]*m[3][2] +
m[0][1]*m[1][3]*m[2][2]*m[3][0] +
m[0][2]*m[1][0]*m[2][1]*m[3][3] -
m[0][2]*m[1][0]*m[2][3]*m[3][1] -
m[0][2]*m[1][1]*m[2][0]*m[3][3] +
m[0][2]*m[1][1]*m[2][3]*m[3][0] +
m[0][2]*m[1][3]*m[2][0]*m[3][1] -
m[0][2]*m[1][3]*m[2][1]*m[3][0] -
m[0][3]*m[1][0]*m[2][1]*m[3][2] +
m[0][3]*m[1][0]*m[2][2]*m[3][1] +
m[0][3]*m[1][1]*m[2][0]*m[3][2] -
m[0][3]*m[1][1]*m[2][2]*m[3][0] -
m[0][3]*m[1][2]*m[2][0]*m[3][1] +
m[0][3]*m[1][2]*m[2][1]*m[3][0]
}
// Compute the determinant of a 4x4-matrix by the sum
// over all index permutations.
func determinantByte(m [4][4]byte) byte {
return m[0][0]*m[1][1]*m[2][2]*m[3][3] -
m[0][0]*m[1][1]*m[2][3]*m[3][2] -
m[0][0]*m[1][2]*m[2][1]*m[3][3] +
m[0][0]*m[1][2]*m[2][3]*m[3][1] +
m[0][0]*m[1][3]*m[2][1]*m[3][2] -
m[0][0]*m[1][3]*m[2][2]*m[3][1] -
m[0][1]*m[1][0]*m[2][2]*m[3][3] +
m[0][1]*m[1][0]*m[2][3]*m[3][2] +
m[0][1]*m[1][2]*m[2][0]*m[3][3] -
m[0][1]*m[1][2]*m[2][3]*m[3][0] -
m[0][1]*m[1][3]*m[2][0]*m[3][2] +
m[0][1]*m[1][3]*m[2][2]*m[3][0] +
m[0][2]*m[1][0]*m[2][1]*m[3][3] -
m[0][2]*m[1][0]*m[2][3]*m[3][1] -
m[0][2]*m[1][1]*m[2][0]*m[3][3] +
m[0][2]*m[1][1]*m[2][3]*m[3][0] +
m[0][2]*m[1][3]*m[2][0]*m[3][1] -
m[0][2]*m[1][3]*m[2][1]*m[3][0] -
m[0][3]*m[1][0]*m[2][1]*m[3][2] +
m[0][3]*m[1][0]*m[2][2]*m[3][1] +
m[0][3]*m[1][1]*m[2][0]*m[3][2] -
m[0][3]*m[1][1]*m[2][2]*m[3][0] -
m[0][3]*m[1][2]*m[2][0]*m[3][1] +
m[0][3]*m[1][2]*m[2][1]*m[3][0]
}
// A right-leaning tree of byte multiplications.
func righttree(a, b, c, d uint8) uint8 {
return a * (b * (c * (d *