println("trap in unknown function", funcname(f))
		return false
	}
	if !sigctxtAtTrapInstruction(ctxt) {
		println("trap at non-INT3 instruction pc =", hex(ctxt.sigpc()))
		return false
	}

	switch status := sigctxtStatus(ctxt); status {
	case 0:
		// Frame is ready. Copy the arguments to the frame and to registers.

index fcf956a..e2c5d29 100644
--- a/sysdeps/ieee754/dbl-64/k_rem_pio2.c
+++ b/sysdeps/ieee754/dbl-64/k_rem_pio2.c
@@ -172,7 +172,8 @@ int __kernel_rem_pio2(double *x, double *y, int e0, int nx, int prec, const int3
 
     /* compute q[0],q[1],...q[jk] */
 	for (i=0;i<=jk;i++) {
-	    for(j=0,fw=0.0;j<=jx;j++) fw += x[j]*f[jx+i-j]; q[i] = fw;
+	    for(j=0,fw=0.0;j<=jx;j++) fw += x[j]*f[jx+i-j];
+	    q[i] = fw;
 	}
 

	// invoke INT3. The debugger should write the argument
	// frame for the call at SP, set up argument registers, push
	// the trapping PC on the stack, set the PC to the function to
	// call, set RDX to point to the closure (if a closure call),
	// and resume execution.
	//
	// If the function returns, this will set R12 to 1 and invoke
	// INT3. The debugger can then inspect any return value saved

	a := uint64(0)
	done := 0
	for {
		b, err := r.ReadByte()
		if err == io.EOF {
			break
		}
		if err != nil {
			t.Fatal("can't read")
		}
		if physicalEdits[a] {
			b = 0xcc // INT3 opcode
			done++
		}
		err = w.WriteByte(b)
		if err != nil {
			t.Fatal("can't write")
		}
		a++
	}
	if done != len(physicalEdits) {
		t.Fatal("physical edits remaining")
	}
	w.Flush()

//
//go:nosplit
func isAbort(r *context) bool {
	pc := r.ip()
	if GOARCH == "386" || GOARCH == "amd64" || GOARCH == "arm" {
		// In the case of an abort, the exception IP is one byte after
		// the INT3 (this differs from UNIX OSes). Note that on ARM,
		// this means that the exception IP is no longer aligned.
		pc--
	}
	return isAbortPC(pc)
}

// isgoexception reports whether this exception should be translated

	return int(*(*uint8)(unsafe.Pointer(&x)))
}

// abort crashes the runtime in situations where even throw might not
// work. In general it should do something a debugger will recognize
// (e.g., an INT3 on x86). A crash in abort is recognized by the
// signal handler, which will attempt to tear down the runtime
// immediately.
func abort()

// Called from compiled code; declared for vet; do NOT call from Go.

	switch inst.Op {
	case 0:
		if inst.Prefix[0] != 0 {
			return strings.ToLower(inst.Prefix[0].String())
		}

	case INT:
		if inst.Opcode>>24 == 0xCC {
			inst.Args[0] = nil
			op = "int3"
		}

	case CMPPS, CMPPD, CMPSD_XMM, CMPSS:
		imm, ok := inst.Args[2].(Imm)
		if ok && 0 <= imm && imm < 8 {
			inst.Args[2] = nil
			op = cmppsOps[imm] + op[3:]
		}

	case PCLMULQDQ: