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386 shift bug; wasn't zero-extending 16- and 8-bit counts 

+test

R=ken
OCL=35801
CL=35801
This commit is contained in:
Russ Cox 2009-10-15 16:32:45 -07:00
parent a75e347a21
commit 4e4097d9d9
2 changed files with 46 additions and 12 deletions
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12
src/cmd/8g/cgen64.c
View File

@ -178,8 +178,10 @@ cgen64(Node *n, Node *res)
gins(ACMPL, &hi2, ncon(0)); gins(ACMPL, &hi2, ncon(0));
p1 = gbranch(AJNE, T); p1 = gbranch(AJNE, T);
gins(AMOVL, &lo2, &cx); gins(AMOVL, &lo2, &cx);
} else } else {
gins(AMOVL, r, &cx); cx.type = types[TUINT32];
gmove(r, &cx);
}
// if shift count is >=64, zero value // if shift count is >=64, zero value
gins(ACMPL, &cx, ncon(64)); gins(ACMPL, &cx, ncon(64));
@ -265,8 +267,10 @@ cgen64(Node *n, Node *res)
gins(ACMPL, &hi2, ncon(0)); gins(ACMPL, &hi2, ncon(0));
p1 = gbranch(AJNE, T); p1 = gbranch(AJNE, T);
gins(AMOVL, &lo2, &cx); gins(AMOVL, &lo2, &cx);
} else } else {
gins(AMOVL, r, &cx); cx.type = types[TUINT32];
gmove(r, &cx);
}
// if shift count is >=64, zero or sign-extend value // if shift count is >=64, zero or sign-extend value
gins(ACMPL, &cx, ncon(64)); gins(ACMPL, &cx, ncon(64));

46
test/64bit.go
View File

@ -459,12 +459,27 @@ const prolog =
"}\n" "}\n"
"\n" "\n"
"func testInt64Shift(a int64, b uint64, left, right int64) {\n" "func testInt64Shift(a int64, b uint64, left, right int64) {\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
" if uint64(uint(b)) == b {\n"
" b := uint(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
" }\n"
" if uint64(uint32(b)) == b {\n" " if uint64(uint32(b)) == b {\n"
" b := uint32(b);\n" " b := uint32(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
" }\n"
" if uint64(uint16(b)) == b {\n"
" b := uint16(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
" }\n"
" if uint64(uint8(b)) == b {\n"
" b := uint8(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
" }\n" " }\n"
"}\n" "}\n"
"\n" "\n"
@ -489,12 +504,27 @@ const prolog =
"}\n" "}\n"
"\n" "\n"
"func testUint64Shift(a, b, left, right uint64) {\n" "func testUint64Shift(a, b, left, right uint64) {\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
" if uint64(uint(b)) == b {\n"
" b := uint(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
" }\n"
" if uint64(uint32(b)) == b {\n" " if uint64(uint32(b)) == b {\n"
" b := uint32(b);\n" " b := uint32(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n" " if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
" }\n"
" if uint64(uint16(b)) == b {\n"
" b := uint16(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
" }\n"
" if uint64(uint8(b)) == b {\n"
" b := uint8(b);\n"
" if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
" if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
" }\n" " }\n"
"}\n" "}\n"
"\n" "\n"