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Add xadd to chibicc

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This commit is contained in:
Justine Tunney 2022-06-21 04:55:27 -07:00
parent 56eff8544f
commit 1216b6e7c7
2 changed files with 23 additions and 0 deletions
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10
third_party/chibicc/as.c vendored
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@ -2328,6 +2328,14 @@ static dontinline void OpBsu(struct As *a, struct Slice opname, int op) {
OpBsuImpl(a, opname, op);
}
static dontinline void OpXadd(struct As *a) {
int reg, modrm, disp;
reg = GetRegisterReg(a);
ConsumeComma(a);
modrm = ParseModrm(a, &disp);
EmitRexOpModrm(a, 0x0FC0, reg, modrm, disp, 1);
}
static dontinline int OpF6Impl(struct As *a, struct Slice s, int reg) {
int modrm, imm, disp;
modrm = ParseModrm(a, &disp);
@ -3109,6 +3117,7 @@ static void OnUcomiss(struct As *a, struct Slice s) { OpSse(a, 0x0F2E); }
static void OnUd2(struct As *a, struct Slice s) { EmitVarword(a, 0x0F0B); }
static void OnUnpckhpd(struct As *a, struct Slice s) { OpSse(a, 0x660F15); }
static void OnUnpcklpd(struct As *a, struct Slice s) { OpSse(a, 0x660F14); }
static void OnXadd(struct As *a, struct Slice s) { OpXadd(a); }
static void OnXor(struct As *a, struct Slice s) { OpAlu(a, s, 6); }
static void OnXorpd(struct As *a, struct Slice s) { OpSse(a, 0x660F57); }
static void OnXorps(struct As *a, struct Slice s) { OpSse(a, 0x0F57); }
@ -3662,6 +3671,7 @@ static const struct Directive8 {
{"unpckhpd", OnUnpckhpd}, //
{"unpcklpd", OnUnpcklpd}, //
{"wait", OnFwait}, //
{"xadd", OnXadd}, //
{"xchg", OnXchg}, //
{"xor", OnXor}, //
{"xorb", OnXor}, //

13
third_party/chibicc/test/atomic_test.c vendored
View file

@ -37,5 +37,18 @@ main() {
ASSERT(4, x);
ASSERT(4, lock);
// CAS success #3
x = 4;
ASSERT(1, __atomic_compare_exchange_n(&lock, &x, 31337, 0, __ATOMIC_SEQ_CST,
__ATOMIC_SEQ_CST));
ASSERT(4, x);
ASSERT(31337, lock);
// xadd
ASSERT(31337, __atomic_fetch_add(&lock, 31337, __ATOMIC_SEQ_CST));
ASSERT(62674, lock);
ASSERT(62674, __atomic_fetch_sub(&lock, 31337, __ATOMIC_SEQ_CST));
ASSERT(31337, lock);
//
}